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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, 2021	Mar. 31, 2020	Mar. 31, 2019
Weighted average grant date fair value
Weighted Average Grant Date Fair Value, Granted	$ 71.53	$ 58.05	$ 75.32
Restricted Stock Units (RSUs)
Number of RSU and MSU
Number of RSU and MSU, Non-vested awards, Beginning Balance	880,335
Number of RSU and MSU, Granted	324,262
Number of RSU and MSU, Stock dividend	8,125
Number of RSU and MSU, Performance factor	0
Number of RSU and MSU, Vested	(279,995)
Number of RSU and MSU, cancelled	(52,443)
Number of RSU and MSU, Non-vested awards, Ending Balance	880,284	880,335
Weighted average grant date fair value
Weighted Average Grant Date Fair Value, Non-vested awards, Beginning Balance	$ 55.61
Weighted Average Grant Date Fair Value, Granted	71.53
Weighted Average Grant Date Fair Value, Stock dividend	57.69
Weighted Average Grant Date Fair Value, Performance factor	0
Weighted Average Grant Date Fair Value, Vested	58.01
Weighted Average Grant Date Fair Value, Canceled	68.94
Weighted Average Grant Date Fair Value, Non-vested awards, Ending Balance	$ 60.07	$ 55.61
Market Share Unit Number (MSU)
Number of RSU and MSU
Number of RSU and MSU, Non-vested awards, Beginning Balance	208,720
Number of RSU and MSU, Granted	37
Number of RSU and MSU, Stock dividend	1,165
Number of RSU and MSU, Performance factor	0
Number of RSU and MSU, Vested	(65,096)
Number of RSU and MSU, cancelled	(18,866)
Number of RSU and MSU, Non-vested awards, Ending Balance	125,960	208,720
Weighted average grant date fair value
Weighted Average Grant Date Fair Value, Non-vested awards, Beginning Balance	$ 80.78
Weighted Average Grant Date Fair Value, Granted	79.51
Weighted Average Grant Date Fair Value, Stock dividend	83.15
Weighted Average Grant Date Fair Value, Performance factor	0
Weighted Average Grant Date Fair Value, Vested	71.17
Weighted Average Grant Date Fair Value, Canceled	98.88
Weighted Average Grant Date Fair Value, Non-vested awards, Ending Balance	$ 83.48	$ 80.78
Performance condition-based Share Units (PSU)
Number of RSU and MSU
Number of RSU and MSU, Non-vested awards, Beginning Balance	101,130
Number of RSU and MSU, Granted	0
Number of RSU and MSU, Stock dividend	917
Number of RSU and MSU, Performance factor	0
Number of RSU and MSU, Vested	0
Number of RSU and MSU, cancelled	(3,701)
Number of RSU and MSU, Non-vested awards, Ending Balance	98,346	101,130
Weighted average grant date fair value
Weighted Average Grant Date Fair Value, Non-vested awards, Beginning Balance	$ 57.49
Weighted Average Grant Date Fair Value, Granted	0
Weighted Average Grant Date Fair Value, Stock dividend	57.52
Weighted Average Grant Date Fair Value, Performance factor	0
Weighted Average Grant Date Fair Value, Vested	0
Weighted Average Grant Date Fair Value, Canceled	56.04
Weighted Average Grant Date Fair Value, Non-vested awards, Ending Balance	$ 57.55	$ 57.49

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