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Reclassifications out of Accumulated Other Comprehensive Loss (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Amounts Reclassified from Accumulated Other Comprehensive Loss        
Income before income tax expense $ 57,701 $ 68,737 $ 137,727 $ 120,418
Income tax expense (15,205) (13,961) (38,690) (26,664)
Net income 42,496 54,776 99,037 93,754
Cash flow hedges | Reclassification out of accumulated other comprehensive loss
        
Amounts Reclassified from Accumulated Other Comprehensive Loss        
Income tax expense (300)   (700)  
Net income 400   800  
Cash flow hedges | Reclassification out of accumulated other comprehensive loss | Interest expense
        
Amounts Reclassified from Accumulated Other Comprehensive Loss        
Income before income tax expense 700   1,500  
Actuarial losses | Reclassification out of accumulated other comprehensive loss
        
Amounts Reclassified from Accumulated Other Comprehensive Loss        
Income tax expense (700)   (1,300)  
Net income 1,500   3,000  
Actuarial losses | Reclassification out of accumulated other comprehensive loss | Cost of revenue and General and administrative expenses
        
Amounts Reclassified from Accumulated Other Comprehensive Loss        
Income before income tax expense $ 2,200   $ 4,300