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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, 2012	Jul. 31, 2011
Earnings Per Share Disclosure [Line Items]
Net earnings attributable to common stockholders	$ 10,418	$ 15,411
Basic weighted-average number of common shares outstanding	46,810	45,969
Restricted stock	661	844
Stock options	184	483
ESPP		3
Diluted weighted-average number of common shares outstanding	47,655	47,299
Basic earnings per share	$ 0.22	$ 0.34
Diluted earnings per share	$ 0.22	$ 0.33

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