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Capital Stock (Stock Option and Restricted Share Unit Activity) (Details) - $ / shares
8 Months Ended
Dec. 08, 2016
Dec. 07, 2016
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding at March 31, 2016 (in shares) 19,393,516 16,093,896
Granted (in shares)   5,997,539
Options exercised (in shares)   (2,145,852)
Forfeited or expired (in shares)   (552,067)
Reclassification of common stock to newly issued Class A common stock and Class B common stock (in shares) (19,393,516)  
Outstanding (in shares) 0 19,393,516
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Outstanding, weighted average exercise price (in usd per share) $ 24.80 $ 23.83
Granted, weighted average exercise price (in usd per share)   22.73
Options exercised, weighted average exercise price (in usd per share)   9.78
Forfeited or expired, weighted average exercise price (in usd per share)   32.39
Outstanding, weighted average exercise price (in usd per share)   $ 24.80
Restricted Share Units (RSUs)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Outstanding at March 31, 2016 (in shares) 1,230,564 1,647,432
Granted (in shares)   1,537,632
RSUs vested (in shares)   (1,789,908)
Forfeited or expired (in shares)   (164,592)
Reclassification of common stock to newly issued Class A common stock and Class B common stock (in shares) (1,230,564)  
Outstanding (in shares) 0 1,230,564
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Outstanding, weighted average grant-date fair value (in usd per share) $ 28.18 $ 31.74
Granted, weighted average grant date fair value (in usd per share)   20.89
RSUs vested, weighted average grant-date fair value (in usd per share)   25.01
Forfeited or expired, weighted average grant-date fair value (in usd per share)   30.18
Outstanding, weighted average grant-date fair value (in usd per share)   $ 28.18