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Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2013
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Earnings Per Share Disclosure [Line Items]                      
Net earnings attributable to common stockholders $ 21,211 $ 21,304 $ 18,759 $ 11,417 $ 12,197 [1] $ 9,482 $ 1,196 $ 10,418 $ 72,691 $ 33,293 $ 54,303
Basic weighted-average number of common shares outstanding                 48,162 47,224 46,397
Diluted weighted-average number of common shares outstanding                 49,145 47,883 47,261
Basic earnings per share $ 0.44 $ 0.44 $ 0.39 $ 0.24 $ 0.26 [1] $ 0.20 $ 0.03 $ 0.22 $ 1.51 $ 0.71 $ 1.17
Diluted earnings per share $ 0.43 $ 0.43 $ 0.38 $ 0.24 $ 0.25 [1] $ 0.20 $ 0.03 $ 0.22 $ 1.48 $ 0.70 $ 1.15
Restricted Stock
                      
Earnings Per Share Disclosure [Line Items]                      
Stock                 789 485 582
Stock Options
                      
Earnings Per Share Disclosure [Line Items]                      
Stock                 194 174 267
ESPP
                      
Earnings Per Share Disclosure [Line Items]                      
Stock                     15
[1] During the three months ended April 30, 2013, the Company implemented a restructuring plan to continue to integrate PDI in order to eliminate redundant positions and consolidate premises. This resulted in restructuring charges, net of recoveries of $2.9 million against operations during the three months ended April 30, 2013.