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Share-Based Employee Compensation - Stock Option Activity (Detail)	6 Months Ended
	Sep. 30, 2024 $ / shares shares
Share-Based Payment Arrangement [Abstract]
Number of Shares, Outstanding Options at March 31, 2024 | shares	252,364
Number of Shares, Granted | shares	5,476
Number of Shares, Exercised | shares	(24,366)
Number of Shares, Cancelled | shares	0
Number of Shares, Outstanding Options at September 30, 2024 | shares	233,474
Number of Shares, Options Exercisable at September 30, 2024 | shares	195,201
Weighted Average Fair Value of Options Granted During the Year | $ / shares	$ 104.45
Weighted-Average Exercise Price, Outstanding Options at March 31, 2024 | $ / shares	91.28
Weighted-Average Exercise Price, Granted | $ / shares	244.92
Weighted-Average Exercise Price, Exercised | $ / shares	97.26
Weighted-Average Exercise Price, Cancelled | $ / shares	0
Weighted-Average Exercise Price, Outstanding Options at September 30, 2024 | $ / shares	$ 94

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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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-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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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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Number of share options (or share units) exercised during the current period.

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