Accounts Payable, Current Accounts payable Accounts Receivable, Net, Current Accounts receivable, net Accrued Income Taxes, Current Income taxes payable AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income [Member] Additional Paid-in Capital [Member] Additional Paid in Capital [Member] Adjustments Related to Tax Withholding for Share-based Compensation Restricted shares withheld from employees for tax obligations Adjustments to additional paid in capital share based compensation performance stock unit requisite service period recognition. Adjustments To Additional Paid In Capital Share Based Compensation Performance Stock Unit Requisite Service Period Recognition Performance stock unit expense Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition Restricted stock expense Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition Stock option expense Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Allocated Share-based Compensation Expense Share-based compensation expense Amendment Flag Amendment Flag Amortization of Financing Costs Amortization of debt issuance costs Amortization of Intangible Assets Amortization expense Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Anti-dilutive options Asset backed revolving credit facility. 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Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Document Period End Date Document Period End Date Document Type Document Type Due from Joint Ventures Amount due from joint venture Earnings Per Share [Abstract] Earnings Per Share [Abstract] Earnings Per Share, Basic Basic income (loss) per common share: Basic net income (loss) per share Earnings Per Share, Diluted Diluted income (loss) per common share: Diluted net income (loss) per share Earnings Per Share [Text Block] Net Income Per Share Effective Income Tax Rate Reconciliation, Percent State and Local effective income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent U.S. federal statutory rate Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Non-U.S. based earnings being taxed at lower rates reducing the effective rate Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent Impact of non-deductible merger and acquisition expenses increasing the tax rate Effect of Exchange Rate on Cash and Cash Equivalents Effect of exchange rate changes on cash flows Employee-related Liabilities, Current Accrued salaries, wages and benefits Employee Stock Option [Member] Stock Option [Member] Entity Central Index Key Entity Central Index Key Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity [Domain] Entity [Domain] Entity Filer Category Entity Filer Category Entity Registrant Name Entity Registrant Name Equity Component [Domain] Equity Component [Domain] Investment, Name [Domain] Investment, Name [Domain] Equity method investment accretion of basis difference from purchase accounting. 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Equity Method Investment Summarized Financial Information Balance Sheet Table [Text Block] Summarized Balance Sheet Information for Joint Venture Equity Method Investment, Summarized Financial Information, Current Assets Current assets Equity Method Investment, Summarized Financial Information, Current Liabilities Current liabilities Equity Method Investment, Summarized Financial Information, Liabilities Total liabilities Equity Method Investment, Summarized Financial Information, Noncurrent Assets Non-current assets Equity Offering [Abstract] Equity Offering [Abstract] Equity Offering [Abstract] Equity Offering [Text Block] Equity Offering [Text Block] Equity Offering Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Inputs, Level 2 [Member] Significant Other Observable Inputs Level 2 [Member] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Finite-Lived Intangible Assets, Accumulated Amortization Accumulated amortization Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Amortization of intangible assets Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Net Intangible asset, net Finite-Lived Intangible Asset, Useful Life Preliminary estimated intangible assets useful life FRANCE French Safeguard [Member] Goodwill Ending Balance Beginning Balance Purchase price allocation, goodwill Goodwill Goodwill, net Goodwill, Acquired During Period Goodwill acquired in acquisition Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill And Intangible Assets [Table] Goodwill And Intangible Assets [Table] Goodwill And Intangible Assets [Table] Goodwill Disclosure [Text Block] Goodwill, net Goodwill, Impairment Loss Impairment of goodwill Goodwill [Line Items] Goodwill [Line Items] Goodwill, Translation Adjustments Currency translation impacts Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income (loss) before provision (benefit) for income taxes and share of net income from joint venture Income (Loss) from Equity Method Investments Our share of cumulative earnings Share of net income from joint venture Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Joint venture net income in excess of cash received Income Statement [Abstract] Income Statement [Abstract] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Income Tax Disclosure [Text Block] Provision for Income Taxes Income Tax Expense (Benefit) Provision (benefit) for income taxes Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments Change in fair value of interest rate hedge Increase (Decrease) in Inventories Inventories Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Other Operating Assets and Liabilities, Net Other assets and liabilities Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Effective of dilutive stock options Intangible Assets Disclosure [Text Block] Intangible Assets, Net Intangible Assets [Line Items] Intangible Assets [Line Items] Intangible Assets [Line Items] Intangible Liability Disclosure [Abstract] Intangible Liability Disclosure [Abstract] Intangible Liability Disclosure [Abstract] Interest Expense Interest expense Interest Expense [Member] Interest Expense [Member] Interest Rate Swap [Member] Forward Starting Interest Rate Swap Contract [Member] Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Inventory Disclosure [Text Block] Inventories Inventory, Finished Goods, Net of Reserves Finished goods Inventory, Net Inventories Inventories Inventory, Raw Materials, Net of Reserves Raw materials Inventory, Work in Process, Net of Reserves Work in process Legal Entity [Axis] Legal Entity [Axis] Liabilities Total liabilities Liabilities and Equity Total liabilities and stockholders' equity Liabilities and Equity [Abstract] Liabilities and Stockholders' Equity Liabilities Assumed Liabilities assumed Liabilities, Current Total current liabilities Liabilities, Current [Abstract] Current liabilities: LIBOR period. Libor Period LIBOR Period Long-term Line of Credit Borrowings under line of credit Line of credit facility covenant compliance amount. Line Of Credit Facility Covenant Compliance Amount ABL borrowing Line of Credit Facility, Current Borrowing Capacity Revolving loan credit facility Line of Credit Facility, Expiration Date Debt maturity date Line of Credit Facility, Expiration Period Maturity period Line of Credit Facility, Interest Rate During Period Lines of credit annual interest rate Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Line of Credit Facility, Maximum Borrowing Capacity Borrowings Line of Credit Facility [Table] Line of Credit Facility [Table] Loans Payable Borrowings under our $350,000 Term Loan B bearing interest at the greater of 1% or 3 month LIBOR (0.283% at September 30, 2015) plus an applicable margin of 5.00% at September 30, 2015 expiring August 29, 2021, net of discount of $4,432. Loans payable Long-term Debt Total debt Long-term Debt, Current Maturities Current maturities of long-term debt Less current maturities of long-term debt Long-term Debt, Excluding Current Maturities Long-term debt, excluding current maturities of long-term debt Long-term debt, net of current portion Notes Payable, Noncurrent Noncurrent maturities of French Safeguard obligations Loss Contingency, Accrual, Current Amount accrued for estimation of loss Loss Contingency, Range of Possible Loss, Maximum Possible loss estimated maximum Loss Contingency, Range of Possible Loss, Minimum Possible loss estimated minimum Maximum [Member] Maximum [Member] Metal bearing components segment. Metal Bearing Components Segment [Member] Metal Bearing Components Segment [Member] Minimum [Member] Minimum [Member] Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Financing Activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash used by investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Investing Activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Operating Activities: Net Income (Loss) Attributable to Parent Net income Net income (loss) Net income (loss) Noncontrolling Interest [Member] Non-controlling Interest [Member] Non Executive Directors [Member] Non Executive Directors [Member] Non-Executive Directors [Member] One time increase to cost of goods sold due to acquire inventory fair value mark up Nonrecurring Cost Of Goods Sold Increase Increase in cost of sales Notes Payable French Safeguard obligations Notes Payable, Current Current maturities of French Safeguard obligations Officer [Member] Officers and Key Employees [Member] Operating Income (Loss) Income (loss) from operations Income from operations Operating Segments [Member] Operating Segments [Member] Other Assets, Current Other current assets Other Assets, Noncurrent Other non-current assets Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Foreign currency translation loss Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive loss: Other Inventory, Materials, Supplies and Merchandise under Consignment, Gross Inventory on consignment at customers' location Other Liabilities, Current Other current liabilities Other Liabilities, Noncurrent Other non-current liabilities Other Nonoperating Income (Expense) Other expense, net Payment for proceeds from equity method investment dividends or distributions return of capital. Payment For Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital Capital contributed to the joint venture Dividends received from joint venture Payments of Debt Issuance Costs Debt issue costs paid Payments of Dividends Dividends paid Payments to Acquire Businesses, Gross Business acquisition, purchase price Payments to acquire Payments to Acquire Businesses, Net of Cash Acquired Operating assets acquired in cash Cash paid to acquire business, net of cash received Payments to Acquire Property, Plant, and Equipment Acquisition of property, plant and equipment Payments to Noncontrolling Interests Payment for acquisition of non-controlling interest Performance Shares [Member] Performance Shares [Member] Plastic and rubber components segment. Plastic And Rubber Components Segment [Member] Plastic and Rubber Components Segment [Member] Potential to expand credit facility under credit agreement. Potential To Expand Credit Facility Under Credit Agreement Potential to expand credit facility under credit agreement Precision Engineered Products [Member] Precision Engineered Products [Member] Precision Engineered Products [Member] Private Placement [Member] Private Placement [Member] Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital Dividends Received Proceeds from Issuance of Common Stock Shares issued Proceeds from Issuance of Long-term Debt Proceeds from long-term debt Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Proceeds from issuance of stock and exercise of stock options Proceeds from Issuance or Sale of Equity Net proceeds to NN from the offering Proceeds from (Repayments of) Short-term Debt Proceeds/(Repayment) from short-term debt, net Proceeds from Sale of Property, Plant, and Equipment Proceeds from disposals of property, plant and equipment Property, Plant and Equipment, Net Property, plant and equipment, net Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Information [Text Block] Interim Financial Statements Range [Axis] Range [Axis] Range [Domain] Range [Domain] Related Party [Domain] Related Party [Domain] Related Party [Axis] Related Party [Axis] Repayments of Long-term Capital Lease Obligations Principal payments on capital lease Repayments of Long-term Debt Repayment of term loan and ABL facilities Repayment of long-term debt Restricted Stock or Unit Expense Expenses related to issuance of restricted stock Restricted Stock [Member] Restricted Stock [Member] Restructuring Reserve Restructuring charges Retained Earnings [Member] Retained Earnings [Member] Revolving Credit Facility [Member] Revolving Credit Facility [Member] RFK Valjcici d. d. Konjic. RFK Valjcici d. d. 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Subsequent Events Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Sale of Stock [Axis] Sale of Stock [Axis] 10.25% Senior Notes Due 2020 [Member] Ten Point Two Five Percent Senior Notes Due Twenty Twenty [Member] 10.25% Senior Notes Due 2020 [Member] Term loan B. Term Loan B [Member] Term Loan B [Member] Term Loan Credit Facility [Member] Term Loan Credit Facility [Member] Term Loan Credit Facility [Member] Text Block [Abstract] Text Block [Abstract] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Trade Names [Member] Trade Name [Member] Trading Symbol Trading Symbol RFK. V-S Industries, V-S Precision, LLC and V-S Precision SA de DV [Member] VS [Member] Weighted Average Number of Shares Outstanding, Diluted Weighted average shares outstanding Diluted shares outstanding Weighted Average Number of Shares Outstanding, Basic Weighted average shares outstanding Wheeling [Member] Wheeling [Member] Wheeling [Member] Write off of Deferred Debt Issuance Cost Debt issuance costs write-off Wuxi Weifu Autocam Precision Machinery Company Ltd [Member] Wuxi Weifu Autocam Precision Machinery Company Ltd [Member] Joint Venture [Member]