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Stock-Based Compensation - Summary of Changes in Restricted Stock Units and Market Share Units (Detail) - $ / shares
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Weighted average grant date fair value      
Weighted Average Grant Date Fair Value, Granted (usd per share) $ 88.27 $ 71.53 $ 58.05
Restricted Stock Units  (RSU)      
Number of RSU and MSU      
Number of Non-vested awards, Beginning Balance (in shares) 880,284    
Number of units, Granted (in shares) 254,436    
Number of units, Stock dividend (in shares) 7,639    
Number of units, Performance factor (in shares) 0    
Number of units, Vested (in shares) (228,765)    
Number of units, Forfeitures (in shares) (35,829)    
Number of Non-vested awards, Ending Balance (in shares) 877,765 880,284  
Weighted average grant date fair value      
Weighted Average Grant Date Fair Value, Non-vested awards, Beginning Balance (usd per share) $ 60.07    
Weighted Average Grant Date Fair Value, Granted (usd per share) 88.27    
Weighted Average Grant Date Fair Value, Stock dividend (usd per share) 64.22    
Weighted Average Grant Date Fair Value, Performance factor (usd per share) 0    
Weighted Average Grant Date Fair Value, Vested (usd per share) 68.34    
Weighted Average Grant Date Fair Value, Forfeitures (usd per share) 73.40    
Weighted Average Grant Date Fair Value, Non-vested awards, Ending Balance (usd per share) $ 65.48 $ 60.07  
Market condition-based Share Units (TSR)      
Number of RSU and MSU      
Number of Non-vested awards, Beginning Balance (in shares) 125,960    
Number of units, Granted (in shares) 0    
Number of units, Stock dividend (in shares) 670    
Number of units, Performance factor (in shares) 1,116    
Number of units, Vested (in shares) (46,295)    
Number of units, Forfeitures (in shares) (6,468)    
Number of Non-vested awards, Ending Balance (in shares) 74,983 125,960  
Weighted average grant date fair value      
Weighted Average Grant Date Fair Value, Non-vested awards, Beginning Balance (usd per share) $ 83.48    
Weighted Average Grant Date Fair Value, Granted (usd per share) 0    
Weighted Average Grant Date Fair Value, Stock dividend (usd per share) 71.04    
Weighted Average Grant Date Fair Value, Performance factor (usd per share) 0    
Weighted Average Grant Date Fair Value, Vested (usd per share) 104.89    
Weighted Average Grant Date Fair Value, Forfeitures (usd per share) 70.77    
Weighted Average Grant Date Fair Value, Non-vested awards, Ending Balance (usd per share) $ 71.25 $ 83.48  
Performance condition-based Share Units (PSU)      
Number of RSU and MSU      
Number of Non-vested awards, Beginning Balance (in shares) 98,346    
Number of units, Granted (in shares) 0    
Number of units, Stock dividend (in shares) 714    
Number of units, Performance factor (in shares) 0    
Number of units, Vested (in shares) (670)    
Number of units, Forfeitures (in shares) (21,517)    
Number of Non-vested awards, Ending Balance (in shares) 76,873 98,346  
Weighted average grant date fair value      
Weighted Average Grant Date Fair Value, Non-vested awards, Beginning Balance (usd per share) $ 57.55    
Weighted Average Grant Date Fair Value, Granted (usd per share) 0    
Weighted Average Grant Date Fair Value, Stock dividend (usd per share) 56.04    
Weighted Average Grant Date Fair Value, Performance factor (usd per share) 0    
Weighted Average Grant Date Fair Value, Vested (usd per share) 68.48    
Weighted Average Grant Date Fair Value, Forfeitures (usd per share) 64.25    
Weighted Average Grant Date Fair Value, Non-vested awards, Ending Balance (usd per share) $ 55.56 $ 57.55