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Stockholders' Equity (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Net income/(loss)        
Income from continuing operations $ 16,401 $ 948 $ 35,272 $ 3,223
Loss from discontinued operations, net of tax 4,784 (2,539) 3,699 (4,025)
Net income/(loss)/comprehensive income/(loss) $ 21,185 $ (1,591) $ 38,971 $ (802)
Weighted average shares outstanding - Basic 65,871 64,697 65,611 64,613
Dilutive effect of stock option and award plans 1,403 413 1,303 517
Diluted shares outstanding 67,274 65,110 66,914 65,130
Earnings per common share - Basic (a)        
Income from continuing operations $ 0.25 $ 0.01 $ 0.54 $ 0.05
Loss from discontinued operations $ 0.07 $ (0.04) $ 0.06 $ (0.06)
Net income $ 0.32 $ (0.02) $ 0.59 $ (0.01)
Earnings per common share - Diluted (a)        
Income from continuing operations $ 0.24 $ 0.01 $ 0.52 $ 0.05
Loss from discontinued operations $ 0.07 $ (0.04) $ 0.06 $ (0.06)
Net income $ 0.31 $ (0.02) $ 0.58 $ (0.01)