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Calculation of Basic and Diluted Common Shares Outstanding (Detail) - shares	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Weighted Average Shares of Common Stock Outstanding	46,275,198	48,221,093	47,059,408	48,132,276
Assumed Exercise of Outstanding Dilutive Options	268,283	887,506	629,968	1,069,152
Less Shares Repurchased from Proceeds of Assumed Exercised Options	(171,402)	(606,549)	(442,898)	(778,985)
Restricted Stock Units	123,915	255,712	156,793	218,987
Weighted Average Common Stock and Dilutive Securities Outstanding	46,495,994	48,757,762	47,403,271	48,641,430
Shares Excluded Due to Anti-dilution Effects	756,035	121,179	360,978	91,089

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- Definition

Shares repurchased from assumed proceeds of assumed exercised options.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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