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Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Earnings Per Share Disclosure [Line Items]
Net earnings attributable to common stockholders	$ 18,759	$ 1,196	$ 30,176	$ 11,614
Basic weighted-average number of common shares outstanding	48,118	47,269	47,892	47,040
Restricted stock	484	397	643	442
Stock options	214	168	213	176
Diluted weighted-average number of common shares outstanding	48,816	47,834	48,748	47,658
Basic earnings per share	$ 0.39	$ 0.03	$ 0.63	$ 0.25
Diluted earnings per share	$ 0.38	$ 0.03	$ 0.62	$ 0.24

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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 portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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