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Fair Value of Financial Instruments (Details 2) - Cross currency swaps - Level 3 - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2015
Sep. 30, 2014
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Level 3 activity          
Beginning balance: $ 8,810 $ (35,922) $ (29,221) $ (18,630) $ (22,254)
Unrealized gain (loss) on cross currency swaps (16,849)   (6,701) 10,591 (13,668)
Ending balance: $ (8,039) $ (18,630) $ (35,922) $ (8,039) $ (35,922)
Minimum          
Fair Value Measurements          
Performance risk for derivative contracts as a percentage of unadjusted liabilities   8.10%   10.10%  
Maximum          
Fair Value Measurements          
Performance risk for derivative contracts as a percentage of unadjusted liabilities   8.50%   10.70%  
Weighted average          
Fair Value Measurements          
Performance risk for derivative contracts as a percentage of unadjusted liabilities   8.30%   10.30%