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Derivative Financial Instruments and Hedging Activities (Additional Information) (Details 1) - USD ($)
3 Months Ended
Nov. 30, 2017
Aug. 31, 2017
Forward contracts    
Derivative [Line Items]    
Aggregate notional amount $ 2,400,000,000 $ 2,100,000,000
Forward contracts | Forward foreign exchange contracts | Cash flow hedging    
Derivative [Line Items]    
Aggregate notional amount 480,700,000 $ 314,600,000
Anticipated debt issuance [Member] | Cash flow hedging    
Derivative [Line Items]    
Aggregate notional amount $ 200,000,000  
Expiry date Mar. 15, 2018  
Term loan facility [Member] | Cash flow hedging    
Derivative [Line Items]    
Aggregate notional amount $ 200,000,000  
Expiry date Jun. 30, 2019