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Product Warranties (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Payables and Accruals [Abstract]    
Product Warranty Beg Balance $ 125,423 $ 183,555
Accrual for Warranties 52,066 1,497
Fulfillment of Warranty Obligations (46,648) (59,629)
Product Warranty End Balance $ 130,841 $ 125,423