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Product Warranties (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Payables and Accruals [Abstract]    
Product Warranty Beg Balance $ 121,450 $ 130,841
Accrual for Warranties 26,539 75,816
Fulfillment of Warranty Obligations (40,451) (85,207)
Product Warranty End Balance $ 107,538 $ 121,450