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Capital Stock (Share Appreciation Rights) (Details) - Share Appreciation Rights (SARs) - $ / shares
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Number of Shares    
Outstanding, beginning balance (in shares) 0 0
Granted (in shares) 836,775  
Exercised (in shares) 0 0
Outstanding, ending balance (in shares) 836,775 0
Weighted-Average Exercise Price    
Outstanding, beginning balance (in dollars per share) $ 0.00 $ 0.00
Granted (in dollars per share) 25.29  
Exercised (in dollars per share) 0.00 0.00
Outstanding, ending balance (in dollars per share) 25.29 0.00
Weighted Average Grant Date Fair Value    
Outstanding, beginning balance (in dollars per share) 0.00 0.00
Granted (in dollars per share) 8.54  
Exercised (in dollars per share) 0.00 0.00
Outstanding, ending balance (in dollars per share) $ 8.54 $ 0.00