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Subsequent Events (Narrative) (Details) - $ / shares
12 Months Ended
May 08, 2017
Aug. 02, 2016
May 09, 2016
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Subsequent Event [Line Items]            
Options granted, shares       264,300 208,200 317,900
Options granted, weighted-average exercise price (in USD per share)       $ 55.86 $ 42.13 $ 33.54
Restricted Stock Units (RSUs)            
Subsequent Event [Line Items]            
Common stock units granted in period, shares   1,896 49,064 68,400 266,100 106,900
Award vesting period     3 years      
Stock Options            
Subsequent Event [Line Items]            
Options granted, shares     224,843      
Award vesting rights, percentage     33.30%      
Award vesting period     3 years      
Expiration period     10 years      
Subsequent event            
Subsequent Event [Line Items]            
Options granted, shares 180,211          
Subsequent event | Performance Shares            
Subsequent Event [Line Items]            
Common stock units granted in period, shares 35,593          
Subsequent event | Restricted Stock Units (RSUs)            
Subsequent Event [Line Items]            
Common stock units granted in period, shares 54,269          
Award vesting period 3 years          
Subsequent event | Stock Options            
Subsequent Event [Line Items]            
Award vesting period 3 years          
Expiration period 10 years          
Options granted, weighted-average exercise price (in USD per share) $ 56.11          
Tranche 1 | Subsequent event | Restricted Stock Units (RSUs)            
Subsequent Event [Line Items]            
Award vesting rights, percentage 33.30%          
Tranche 1 | Subsequent event | Stock Options            
Subsequent Event [Line Items]            
Award vesting rights, percentage 33.30%          
Tranche 2 | Subsequent event | Restricted Stock Units (RSUs)            
Subsequent Event [Line Items]            
Award vesting rights, percentage 33.30%          
Tranche 2 | Subsequent event | Stock Options            
Subsequent Event [Line Items]            
Award vesting rights, percentage 33.30%          
Tranche 3 | Subsequent event | Restricted Stock Units (RSUs)            
Subsequent Event [Line Items]            
Award vesting rights, percentage 33.30%          
Tranche 3 | Subsequent event | Stock Options            
Subsequent Event [Line Items]            
Award vesting rights, percentage 33.30%