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Calculation of Basic and Diluted Common Shares Outstanding (Detail) - shares
3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Weighted-Average Shares of Common Stock Outstanding 41,222,161 41,450,013 41,623,187 41,430,511
Assumed Exercise of Outstanding Dilutive Options 560,876 414,338 606,876 272,513
Less Shares Repurchased from Proceeds of Assumed Exercised Options (365,887) (320,410) (395,516) (191,050)
Restricted Stock Units 177,583 105,378 179,300 94,427
Weighted-Average Common Stock and Dilutive Securities Outstanding 41,594,733 41,649,319 42,013,847 41,606,401
Shares Excluded Due to Anti-Dilution Effects 3,578 795,382 2,684 929,990