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Stockholders' Equity - Incentive Plans (Details) - Stock Incentive Plan 2015
12 Months Ended
Mar. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares authorized (in shares) 1,275,000
Maximum number of shares that may be issued through exercise of stock options (in shares) 750,000
Annual PSUs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting period (in years) 3 years
Granted (in shares) 54,090
Granted (in dollars per share) | $ / shares $ 68.44
Annual Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting period (in years) 3 years
Granted (in shares) 133,464
Granted (in dollars per share) | $ / shares $ 67.70