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Calculation of Basic and Diluted Common Shares Outstanding (Detail) - shares	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Weighted-Average Shares of Common Stock Outstanding	49,828,189	49,591,495	49,797,972	49,546,916
Assumed Exercise of Outstanding Dilutive Options	1,278,908	1,423,211	1,303,636	1,453,437
Less: Shares Repurchased from Assumed Proceeds of Assumed Exercised Options	(866,236)	(891,837)	(871,354)	(933,050)
Restricted Shares	229,290	304,417	230,693	290,611
Weighted-Average Common and Common Equivalent Shares Outstanding	50,470,151	50,427,286	50,460,947	50,357,914
Shares Excluded Due to Anti-dilution Effects	596,973	218,636	527,330	170,227

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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 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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