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Stock-Based Compensation and Stock Options - Outstanding Options (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options outstanding, beginning balance, Shares	1,063,254	1,151,722	1,064,439	1,143,928
Granted, Number of Options	59,800	73,650	116,600	151,050
Exercised, Number of Options	(66,870)	(145,911)	(121,108)	(211,832)
Cancelled - forfeited, Number of Options	(473)
Cancelled - expired, Number of Options	(2,404)
Options outstanding, ending balance, Shares	1,053,307	1,068,503	1,053,307	1,068,503
Ending vested and expected to vest, Number of Options	944,112		944,112
Ending exercisable, Number of Options	419,729		419,729
Options outstanding, beginning balance, Weighted Average Exercise Price	$ 40.43	$ 33.24	$ 39.45	$ 32.02
Granted, Weighted Average Exercise Price per Share	57.35	48.35	53.48	47.11
Exercised, Weighted Average Exercise Price per Share	33.50	25.60	32.30	25.93
Cancelled - forfeited, Weighted Average Exercise Price per Share	41.83
Cancelled - expired, Weighted Average Exercise Price per Share	37.43
Options outstanding, ending balance, Weighted Average Exercise Price	41.81	$ 35.28	41.81	$ 35.28
Ending vested and expected to vest, Weighted Average Exercise Price per Share	42.79		42.79
Ending exercisable, Weighted Average Exercise Price per Share	$ 34.08		$ 34.08
Option outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 5 months 1 day
Ending vested and expected to vest, Weighted Average Remaining Contractual Life (Years)	3 years 6 months 29 days
Ending exercisable, Weighted Average Remaining Contractual Life (Years)	2 years 8 months 1 day
Option outstanding, Aggregate Intrinsic Value	$ 19,420,784		$ 19,420,784
Ending vested and expected to vest, Aggregate Intrinsic Value	18,857,884		18,857,884
Ending exercisable, Aggregate Intrinsic Value	$ 10,983,262		$ 10,983,262

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