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Detail of Certain Balance Sheet Accounts - AP (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Accounts Payable and Accrued Liabilities [Abstract]    
Accounts Payable, Trade $ 75,293 $ 63,246
Accrued Employee Benefits 34,058 33,561
Accrued Insurance 6,202 6,204
Other Accrued Liabilities 15,038 17,699
Accounts Payable and Accrued Liabilities, Current, Total $ 130,591 $ 120,710