Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 47,557	$ 160,194	$ 143,769
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment, net of tax of $0 for all periods	(47,177)	(24,069)	7,165
Amortization of net actuarial pension loss included in net income, net of tax of $18.5 million, $0.3 million, and $1.6 million in 2015, 2014 and 2013, respectively	52,249	3,048	2,772
Pension net gain (loss) arising during the period net of tax of $1.6 million, $2.8 million and ($6.3 million) in 2015, 2014, and 2013, respectively	(4,797)	(24,267)	11,971
Change in unamortized pension loss during the period related to changes in foreign currency	2,350	2,081	(567)
Other comprehensive income (loss)	2,625	(43,207)	21,341
Comprehensive income	$ 50,182	$ 116,987	$ 165,110