Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Additions to and reclassifications out of accumulated other comprehensive income (loss)
Other comprehensive income (loss) before reclassifications	$ (30,744)	$ 11,413
Amount reclassified from accumulated other comprehensive income (loss)	1,159	1,868
Balance at beginning of period	(29,203)	(13,583)
Balance at end of period	(58,788)	(302)
Foreign currency translation adjustment
Additions to and reclassifications out of accumulated other comprehensive income (loss)
Other comprehensive income (loss) before reclassifications	(30,306)	12,196
Balance at beginning of period	(28,482)	(9,681)
Balance at end of period	(58,788)	2,515
Gains and losses on cash flow hedges
Additions to and reclassifications out of accumulated other comprehensive income (loss)
Other comprehensive income (loss) before reclassifications	(438)	(783)
Amount reclassified from accumulated other comprehensive income (loss)	1,159	1,868
Balance at beginning of period	(721)	(3,902)
Balance at end of period		$ (2,817)