Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Additions to and reclassifications out of accumulated other comprehensive income (loss)
Balance at beginning of period	$ (111,243)	$ (324)	$ (29,203)	$ (13,582)
Other comprehensive income (loss) before reclassifications	34,724	10,667	(48,475)	20,910
Amount reclassified from accumulated other comprehensive income (loss)		1,159	1,159	4,174
Balance at end of period	(76,519)	11,502	(76,519)	11,502
Foreign currency translation adjustment
Additions to and reclassifications out of accumulated other comprehensive income (loss)
Balance at beginning of period	(111,243)	1,809	(28,482)	(9,679)
Other comprehensive income (loss) before reclassifications	34,724	11,127	(48,037)	22,615
Balance at end of period	$ (76,519)	12,936	(76,519)	12,936
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)	(721)	(3,903)
Other comprehensive income (loss) before reclassifications		(460)	(438)	(1,705)
Amount reclassified from accumulated other comprehensive income (loss)		1,159	$ 1,159	4,174
Balance at end of period		$ (1,434)		$ (1,434)