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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, 2019
Mar. 31, 2018
Mar. 31, 2017
Weighted average grant date fair value      
Weighted Average Grant Date Fair Value, Granted $ 75.32 $ 73.39 $ 65.88
Restricted Stock Units (RSUs)      
Number of RSU and MSU      
Number of RSU and MSU, Non-vested awards, Beginning Balance 633,751    
Number of RSU and MSU, Granted 241,105    
Number of RSU and MSU, Stock dividend 6,087    
Number of RSU and MSU, Vested (148,487)    
Number of RSU and MSU, cancelled (10,809)    
Number of RSU and MSU, Non-vested awards, Ending Balance 721,647 633,751  
Weighted average grant date fair value      
Weighted Average Grant Date Fair Value, Non-vested awards, Beginning Balance $ 56.60    
Weighted Average Grant Date Fair Value, Granted 69.43    
Weighted Average Grant Date Fair Value, Stock dividend 56.81    
Weighted Average Grant Date Fair Value, Vested 68.55    
Weighted Average Grant Date Fair Value, Canceled 72.56    
Weighted Average Grant Date Fair Value, Non-vested awards, Ending Balance $ 57.72 $ 56.60  
Market Share Unit Number (MSU)      
Number of RSU and MSU      
Number of RSU and MSU, Non-vested awards, Beginning Balance 349,941    
Number of RSU and MSU, Granted 36,646    
Number of RSU and MSU, Stock dividend 3,131    
Number of RSU and MSU, Performance factor 143    
Number of RSU and MSU, Vested (3,482)    
Number of RSU and MSU, cancelled (33,795)    
Number of RSU and MSU, Non-vested awards, Ending Balance 352,584 349,941  
Weighted average grant date fair value      
Weighted Average Grant Date Fair Value, Non-vested awards, Beginning Balance $ 70.22    
Weighted Average Grant Date Fair Value, Granted 85.84    
Weighted Average Grant Date Fair Value, Stock dividend 72.60    
Weighted Average Grant Date Fair Value, Performance factor 75.48    
Weighted Average Grant Date Fair Value, Vested 59.94    
Weighted Average Grant Date Fair Value, Canceled 62.21    
Weighted Average Grant Date Fair Value, Non-vested awards, Ending Balance $ 72.83 $ 70.22  
Performance condition-based Share Units (PSU)      
Number of RSU and MSU      
Number of RSU and MSU, Non-vested awards, Beginning Balance 0    
Number of RSU and MSU, Granted 45,883    
Number of RSU and MSU, Stock dividend 320    
Number of RSU and MSU, Performance factor 0    
Number of RSU and MSU, Vested 0    
Number of RSU and MSU, cancelled (3,677)    
Number of RSU and MSU, Non-vested awards, Ending Balance 42,526 0  
Weighted average grant date fair value      
Weighted Average Grant Date Fair Value, Non-vested awards, Beginning Balance $ 0    
Weighted Average Grant Date Fair Value, Granted 68.48    
Weighted Average Grant Date Fair Value, Stock dividend 68.48    
Weighted Average Grant Date Fair Value, Performance factor 0    
Weighted Average Grant Date Fair Value, Vested 0    
Weighted Average Grant Date Fair Value, Canceled 68.48    
Weighted Average Grant Date Fair Value, Non-vested awards, Ending Balance $ 68.48 $ 0