Detail of Certain Balance Sheet Accounts - AP (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Accounts Payable and Accrued Liabilities [Abstract]
Accounts Payable, Trade	$ 64,963	$ 47,033
Accrued Employee Benefits	26,827	22,527
Accrued Insurance	5,464	4,518
Other Accrued Liabilities	11,568	8,832
Accounts Payable and Accrued Liabilities, Current, Total	$ 108,822	$ 82,910