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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, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011	Oct. 31, 2010
Basic And Diluted Earnings Per Share [Abstract]
Net earnings attributable to common stockholders	$ 15,147	$ 13,656	$ 30,558	$ 24,560
Basic weighted-average number of common shares outstanding	46,499,000	45,130,000	46,234,000	44,886,000
Restricted stock	392,000	459,000	573,000	842,000
Stock options	219,000	328,000	329,000	326,000
ESPP	4,000	1,000	15,000	7,000
Diluted weighted-average number of common shares outstanding	47,114,000	45,918,000	47,151,000	46,061,000
Basic earnings per share	$ 0.33	$ 0.30	$ 0.66	$ 0.55
Diluted earnings per share	$ 0.32	$ 0.30	$ 0.65	$ 0.53
Antidilutive securities excluded from computation of earnings per share, amount	700,000	1,100,000	400,000	1,100,000

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