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Schedule of Earnings Per Share (Detail) - shares	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Weighted-Average Shares of Common Stock Outstanding	46,620,894	48,141,226	47,931,518
Assumed Exercise of Outstanding Dilutive Options	539,135	1,013,764	1,000,556
Less Shares Repurchased from Proceeds of Assumed Exercised Options	(374,380)	(727,904)	(726,223)
Restricted Stock Units	146,731	218,900	155,435
Weighted-Average Common Stock and Dilutive Securities Outstanding	46,932,380	48,645,986	48,361,286

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Shares repurchased from assumed proceeds of assumed exercised options.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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