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Product Warranties (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Payables and Accruals [Abstract]    
Balance at the beginning of the period $ 107,538 $ 121,450
Accruals for warranties for products sold in the period 34,207 26,539
Fulfillment of warranty obligations (37,007) (40,451)
Balance at the end of the period $ 104,738 $ 107,538