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Stock-Based Compensation and Stock Options - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-statutory stock options expiration period     5 years  
Weighted-average grant-date fair value of options granted $ 20.44 $ 21.55    
Time Based Options and Performance Based Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 1,023,000 $ 852,000 $ 3,110,000 $ 2,382,000
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 360,000 $ 230,000 $ 1,201,000 $ 455,000
Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-statutory stock options expiration period     10 years  
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock grants 19,865,000   19,865,000  
Non-statutory stock options vesting period     36 months  
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-statutory stock options vesting period     1 year  
Share-based Compensation Award, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Percentage     25.00%  
Share-based Compensation Award, Tranche Two [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Percentage     75.00%