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Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Earnings Per Share Disclosure [Line Items]
Net earnings attributable to common stockholders	$ 21,304	$ 9,482	$ 51,480	$ 21,096
Basic weighted-average number of common shares outstanding	48,341	47,367	48,041	47,149
Diluted weighted-average number of common shares outstanding	49,181	48,015	48,977	47,742
Basic earnings per share	$ 0.44	$ 0.20	$ 1.07	$ 0.45
Diluted earnings per share	$ 0.43	$ 0.20	$ 1.05	$ 0.44
Restricted Stock
Earnings Per Share Disclosure [Line Items]
Stock	651	491	728	426
Stock Options
Earnings Per Share Disclosure [Line Items]
Stock	189	157	208	167

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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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