CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statement of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ 42,076	$ 29,657	$ (2,715)
Foreign currency translation adjustment	(1,719)	833	(19)
Unrealized gain on cash flow hedges, net of tax			111
Postretirement benefit adjustment, net of tax	25	159	(111)
Comprehensive income (loss)	$ 40,382	$ 30,649	$ (2,734)