Financing Arrangements (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014	Jun. 30, 2014
Total borrowings under Senior Secured Credit Facility	$ 262,548	$ 215,389	$ 288,019
Less: current portion	(85,360)	(29,764)	(99,581)
Total long-term portion of borrowings under Senior Secured Credit Facility	177,188	185,625	188,438
Less: current portion	(16,474)	(16,602)	(15,466)
Canadian Revolver
Total borrowings under Senior Secured Credit Facility	12,010	10,714	11,246
US Revolver
Total borrowings under Senior Secured Credit Facility	62,100	7,800	77,085
Term Loan
Total borrowings under Senior Secured Credit Facility	188,438	196,875	199,688
Equipment Financing Facilities
Total borrowings under Equipment Financing Facilities	26,927	30,966	22,043
Less: current portion	(5,224)	(5,352)	(4,216)
Total long-term portion of borrowings under equipment financing facilities	$ 21,703	$ 25,614	$ 17,827