CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 16,120	$ 29,702	$ 24,549	$ 44,016
Other comprehensive income (loss):
Foreign currency translation	3,645	(15,338)	11,862	(13,989)
Change in net unrealized gains/losses from cash flow hedges:
Change in fair value of cash flow hedges, net of tax	(1,288)	(732)	(181)	(1,337)
Adjustment for net gains/losses realized and included in net income, net of tax	(55)	(13)	(23)	1,334
Total change in net unrealized gains/losses from cash flow hedges, net of tax	(1,343)	(745)	(204)	(3)
Total other comprehensive income (loss)	2,302	(16,083)	11,658	(13,992)
Total comprehensive income	$ 18,422	$ 13,619	$ 36,207	$ 30,024