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Derivative Financial Instruments and Hedging Activities (Details 1) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Aug. 31, 2007
Aug. 31, 2016
May 31, 2017
Forward foreign exchange contracts      
Derivative [Line Items]      
Aggregate notional amount outstanding   $ 1,700.0 $ 1,700.0
Forward foreign exchange contracts | Cash Flow Hedging      
Derivative [Line Items]      
Aggregate notional amount outstanding   323.3 $ 178.7
8.250% Senior Notes Due 2018 | Interest rate swap | Cash Flow Hedging      
Derivative [Line Items]      
Aggregate notional amount outstanding $ 400.0    
Payment to settle interest rate swaps $ 43.1    
Expiry date Mar. 15, 2018    
Anticipated Debt Issuance [Member] | Cash Flow Hedging      
Derivative [Line Items]      
Aggregate notional amount outstanding   $ 200.0  
Expiry date   Mar. 15, 2018  
Term Loan Facility [Member] | Cash Flow Hedging      
Derivative [Line Items]      
Aggregate notional amount outstanding   $ 200.0  
Expiry date   Jun. 30, 2019