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Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Earnings Per Share Disclosure [Line Items]
Net earnings attributable to common stockholders	$ 11,417	$ 10,418
Basic weighted-average number of common shares outstanding	47,665	46,810
Restricted stock	659	661
Stock options	195	184
Diluted weighted-average number of common shares outstanding	48,519	47,655
Basic earnings per share	$ 0.24	$ 0.22
Diluted earnings per share	$ 0.24	$ 0.22

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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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