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Stock Option Activity (Detail) - $ / shares	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding Options at Beginning of Year	958,136	1,323,379	1,817,763
Number of Shares, Granted	125,734	119,986	202,364
Number of Shares, Exercised	(38,748)	(448,295)	(677,566)
Number of Shares, Cancelled	(2,197)	(36,934)	(19,182)
Number of Shares, Outstanding Options at End of Year	1,042,925	958,136	1,323,379
Number of Shares, Options Exercisable at End of Year	651,218	651,218	874,116
Weighted-Average Exercise Price, Outstanding Options at Beginning of Year	$ 72.52	$ 66.07	$ 53.03
Weighted-Average Exercise Price, Granted	103.53	100.20	77.76
Weighted-Average Exercise Price, Exercised	54.27	60.27	34.46
Weighted-Average Exercise Price, Cancelled	100.88	79.97	70.30
Weighted-Average Exercise Price, Outstanding Options at End of Year	76.88	72.52	66.07
Weighted Average Fair Value of Options Granted during the Year	$ 33.11	$ 33.37	$ 25.22

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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