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Equity Earnings (Loss) of Joint Ventures (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jun. 28, 2015
Apr. 01, 2018
Jul. 02, 2017
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%  
Outstanding balance on loan from STRATTEC to equity method investment   $ 2,600,000 $ 2,600,000
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