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Fair Value of Financial Instruments (Details 2) (Cross currency swaps, Level 3, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Minimum
Sep. 30, 2013
Minimum
Jun. 30, 2014
Maximum
Sep. 30, 2013
Maximum
Jun. 30, 2014
Weighted average
Sep. 30, 2013
Weighted average
Fair Value Measurements                    
Performance risk for derivative contracts as a percentage of unadjusted liabilities         7.60% 9.50% 7.70% 10.30% 7.70% 9.80%
Level 3 activity                    
Beginning balance: $ (29,221) $ (6,127) $ (22,254) $ (24,862)            
Unrealized (loss) gain on cross currency swaps (6,701) 3,492 (13,668) 22,227            
Ending balance: $ (35,922) $ (2,635) $ (35,922) $ (2,635)