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Reclassifications out of Accumulated Other Comprehensive Loss (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Amounts Reclassified from Accumulated Other Comprehensive Loss        
Income before income tax expense $ 82,769 $ 101,394 $ 220,496 $ 221,812
Income tax expense (13,677) (30,179) (52,367) (56,843)
Net income 69,092 71,215 168,129 164,969
Cash flow hedges | Reclassification out of accumulated other comprehensive loss
        
Amounts Reclassified from Accumulated Other Comprehensive Loss        
Income tax expense (300)   (1,000)  
Net income 400   1,300  
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   2,300  
Actuarial losses | Reclassification out of accumulated other comprehensive loss
        
Amounts Reclassified from Accumulated Other Comprehensive Loss        
Income tax expense (700)   (2,000)  
Net income 1,500   4,500  
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 $ 2,200   $ 6,500