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Basic And Diluted Earnings Per Share (Summary Of Basic And Diluted Earnings Per Share ) (Details) (USD $) In Thousands, except Share data	3 Months Ended
	Jul. 31, 2011	Jul. 31, 2010
Basic And Diluted Earnings Per Share
Net earnings attributable to common stockholders:	$ 15,411	$ 10,904
Basic weighted-average number of common shares outstanding	45,969,000	44,642,000
Restricted stock	844,000	780,000
Stock options	483,000	326,000
ESPP	3,000	7,000
Diluted weighted-average number of common shares outstanding	47,299,000	45,755,000
Basic earnings per share	$ 0.34	$ 0.24
Diluted earnings per share	$ 0.33	$ 0.24
Options outstanding for computation of anti-dilutive shares	100,000	1,100,000

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