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Stock Option Activity (Detail)	6 Months Ended
	Sep. 30, 2021 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding Options at March 31, 2021 | shares	708,501
Number of Shares, Granted | shares	11,316
Number of Shares, Exercised | shares	(172,057)
Number of Shares, Cancelled | shares	(15,390)
Number of Shares, Outstanding Options at September 30, 2021 | shares	532,370
Number of Shares, Options Exercisable at September 30, 2021 | shares	273,827
Weighted-Average Exercise Price, Outstanding Options at March 31, 2021 | $ / shares	$ 83.85
Weighted-Average Exercise Price, Granted | $ / shares	140.42
Weighted-Average Exercise Price, Exercised | $ / shares	85.01
Weighted-Average Exercise Price, Cancelled | $ / shares	76.63
Weighted-Average Exercise Price, Outstanding Options at September 30, 2021 | $ / shares	84.89
Weighted Average Fair Value of Options Granted During the Year | $ / shares	$ 49.18

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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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