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Stock Option Activity (Detail) - $ / shares	9 Months Ended
	Dec. 31, 2020	Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding Options at March 31, 2020	1,160,091
Number of Shares, Granted	178,946
Number of Shares, Exercised	(166,887)
Number of Shares, Cancelled	(15,094)
Number of Shares, Outstanding Options at December 31, 2020	1,160,091	1,157,056
Number of Shares, Options Exercisable at Decenber 31, 2020	747,796
Weighted-Average Exercise Price, Outstanding Options at March 31, 2020	$ 80.36
Weighted-Average Exercise Price, Granted	60.20
Weighted-Average Exercise Price, Exercised	55.42
Weighted-Average Exercise Price, Cancelled	92.51
Weighted-Average Exercise Price, Outstanding Options at December 31, 2020	80.36	$ 80.68
Weighted Average Fair Value of Options Granted During the Year	$ 22.04

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

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