CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Consolidated Statement of Comprehensive Income (Loss) [Abstract]
Net income	$ 29,224	$ 42,076	$ 29,657
Foreign currency translation adjustments	(4,447)	(1,719)	833
Postretirement benefit adjustment, net of tax	17	25	159
Comprehensive income	$ 24,794	$ 40,382	$ 30,649