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Calculation of Basic and Diluted Common Shares Outstanding (Detail) - shares	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Weighted Average Shares of Common Stock Outstanding	47,219,532	48,053,733	47,453,655	48,087,625
Assumed Exercise of Outstanding Dilutive Options	785,848	1,060,209	807,861	1,159,975
Less Shares Repurchased from Proceeds of Assumed Exercised Options	(588,900)	(801,684)	(580,350)	(865,203)
Restricted Stock Units	147,338	192,509	172,306	197,587
Weighted Average Common Stock and Dilutive Securities Outstanding	47,563,818	48,504,767	47,853,472	48,579,984
Shares Excluded Due to Anti-dilution Effects	181,412	88,729	163,450	76,044

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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.

+ References

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-Publisher FASB
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-Topic 260
-SubTopic 10
-Section 50
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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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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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