Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 160,194	$ 143,769	$ (35,398)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment, net of tax of $0 for all periods	(24,069)	7,165	(2,176)
Amortization of net actuarial pension loss included in net income, net of tax of $0.3 million, $1.6 million and $1.3 million in 2014, 2013 and 2012, respectively	3,048	2,772	2,046
Pension net gain (loss) arising during the period net of tax of $2.8 million, ($6.3 million) and $5.9 million in 2014, 2013 and 2012, respectively	(22,186)	11,404	(7,607)
Other comprehensive income (loss)	(43,207)	21,341	(7,737)
Comprehensive income (loss)	$ 116,987	$ 165,110	$ (43,135)