Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Additions to and reclassifications out of accumulated other comprehensive income (loss)
Balance at beginning of period	$ (324)	$ (58,697)	$ (13,584)	$ (18,594)
Other comprehensive income (loss) before reclassifications	10,667	(3,552)	20,910	(47,828)
Amount reclassified from accumulated other comprehensive income (loss)	1,159	1,855	4,174	6,029
Balance at end of period	11,502	(60,393)	11,502	(60,393)
Foreign currency translation adjustment
Additions to and reclassifications out of accumulated other comprehensive income (loss)
Balance at beginning of period	1,809	(52,652)	(9,679)	(10,288)
Other comprehensive income (loss) before reclassifications	11,127	(2,857)	22,615	(45,221)
Balance at end of period	12,936	(55,509)	12,936	(55,509)
Gains and losses on cash flow hedges
Additions to and reclassifications out of accumulated other comprehensive income (loss)
Balance at beginning of period	(2,133)	(6,045)	(3,903)	(8,306)
Other comprehensive income (loss) before reclassifications	(460)	(695)	(1,705)	(2,607)
Amount reclassified from accumulated other comprehensive income (loss)	1,159	1,855	4,174	6,029
Balance at end of period	$ (1,434)	$ (4,884)	$ (1,434)	$ (4,884)