Fair Value of Financial Instruments (Details 2) (Cross currency swaps, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Level 3 activity
Beginning balance:	$ (6,127)	$ (18,859)	$ (24,862)	$ (11,126)
Unrealized gain (loss) on cross hedging instruments	3,492	5,009	22,227	(2,724)
Ending balance:	$ (2,635)	$ (13,850)	$ (2,635)	$ (13,850)
Minimum | Level 3
Fair Value Measurements
Performance risk for derivative contracts as a percentage of unadjusted liabilities			20.80%
Maximum | Level 3
Fair Value Measurements
Performance risk for derivative contracts as a percentage of unadjusted liabilities			56.40%
Weighted average | Level 3
Fair Value Measurements
Performance risk for derivative contracts as a percentage of unadjusted liabilities			29.60%