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Reclassifications out of Accumulated Other Comprehensive Loss (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Amounts Reclassified from Accumulated Other Comprehensive Loss    
Income before income tax expense $ 80,026 $ 51,681
Income tax expense (23,485) (12,703)
Net income 56,541 38,978
Cash flow hedges | Reclassification out of accumulated other comprehensive loss
    
Amounts Reclassified from Accumulated Other Comprehensive Loss    
Income tax expense (300)  
Net income 500  
Cash flow hedges | Reclassification out of accumulated other comprehensive loss | Interest expense
    
Amounts Reclassified from Accumulated Other Comprehensive Loss    
Income before income tax expense 800  
Actuarial losses | Reclassification out of accumulated other comprehensive loss
    
Amounts Reclassified from Accumulated Other Comprehensive Loss    
Income tax expense (600)  
Net income 1,500  
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 $ 2,100