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Equity Earnings (Loss) of Joint Ventures (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Feb. 16, 2016
Jun. 28, 2015
Jan. 01, 2017
Dec. 27, 2015
Jul. 03, 2016
Schedule Of Equity Method Investments [Line Items]          
Repayments of borrowings under credit facility     $ 21,000,000 $ 5,500,000  
VAST LLC          
Schedule Of Equity Method Investments [Line Items]          
STRATTEC's percentage ownership in joint venture     33.33%    
SAL LLC          
Schedule Of Equity Method Investments [Line Items]          
STRATTEC's percentage ownership in joint venture   51.00% 51.00%    
Outstanding balance on loan from STRATTEC to equity method investment     $ 1,700,000   $ 325,000
Percentage of funding in joint venture through loans   100.00% 100.00%    
Percentage of losses of joint venture, up to committed financial support, recognized by STRATTEC   100.00% 100.00%    
SAL LLC | Westinghouse Agreement          
Schedule Of Equity Method Investments [Line Items]          
Guarantee liability     $ 250,000   $ 250,000
SAL LLC | STRATTEC Advanced Logic Credit Facility          
Schedule Of Equity Method Investments [Line Items]          
Secured revolving credit facility $ 1,500,000        
Credit facility maturity date     Feb. 16, 2016    
Outstanding borrowings under the credit facility 1,500,000        
SAL LLC | STRATTEC Advanced Logic Credit Facility | Registrant's Guarantee of STRATTEC Advanced Logic Credit Facility          
Schedule Of Equity Method Investments [Line Items]          
Repayments of borrowings under credit facility $ 1,500,000