Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Additions to and reclassifications out of accumulated other comprehensive income (loss)
Balance at beginning of period	$ (13,584)	$ (18,594)
Other comprehensive income before reclassifications	11,413	(2,310)
Amount reclassified from accumulated other comprehensive income (loss)	1,868	2,339
Balance at end of period	(303)	(18,565)
Foreign currency translation adjustment
Additions to and reclassifications out of accumulated other comprehensive income (loss)
Balance at beginning of period	(9,682)	(10,288)
Other comprehensive income before reclassifications	12,196	(1,279)
Balance at end of period	2,514	(11,567)
Gains and loses on cash flow hedges
Additions to and reclassifications out of accumulated other comprehensive income (loss)
Balance at beginning of period	(3,902)	(8,306)
Other comprehensive income before reclassifications	(783)	(1,031)
Amount reclassified from accumulated other comprehensive income (loss)	1,868	2,339
Balance at end of period	$ (2,817)	$ (6,998)