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Sale of Investment (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 29, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Sep. 16, 2015
Schedule of Equity Method Investments [Line Items]            
Equity method investment   $ 0 $ 2,615      
Gain on sale of other assets   $ 2,883 0 $ 2,576    
Kingstone Holding Company            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage         15.00%  
Fair Value, Inputs, Level 2 | Kingstone Shanghai            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, fair value           $ 2,700
Equity method investment     $ 2,600      
Kingstone            
Schedule of Equity Method Investments [Line Items]            
Remaining ownership percentage disposed of 15.00%          
Proceeds from sale of business $ 5,700          
Kingstone | Kingstone Holding Company            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage           15.00%