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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 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Minimum
Sep. 30, 2013
Minimum
Mar. 31, 2014
Maximum
Sep. 30, 2013
Maximum
Mar. 31, 2014
Weighted average
Sep. 30, 2013
Weighted average
Fair Value Measurements                    
Performance risk for derivative contracts as a percentage of unadjusted liabilities         8.30% 9.50% 8.50% 10.30% 8.40% 9.80%
Level 3 activity                    
Beginning balance: $ (27,359) $ (25,877) $ (22,254) $ (24,862)            
Unrealized loss on cross hedging instruments (1,862) 19,750 (6,967) 18,735            
Ending balance: $ (29,221) $ (6,127) $ (29,221) $ (6,127)