Annual report pursuant to Section 13 and 15(d)

Basic and Diluted Earnings Per Share (Detail)

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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, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Earnings Per Share Disclosure [Line Items]                      
Net earnings attributable to common stockholders $ 12,197 [1] $ 9,482 $ 1,196 $ 10,418 $ 12,028 $ 11,717 $ 15,147 $ 15,411 $ 33,293 $ 54,303 $ 58,874
Basic weighted-average number of common shares outstanding                 47,224 46,397 45,205
Restricted stock                 485 582 646
Stock options                 174 267 425
ESPP                   15 4
Diluted weighted-average number of common shares outstanding                 47,883 47,261 46,280
Basic earnings per share $ 0.26 [1] $ 0.20 $ 0.03 $ 0.22 $ 0.26 $ 0.25 $ 0.33 $ 0.34 $ 0.71 $ 1.17 $ 1.30
Diluted earnings per share $ 0.25 [1] $ 0.20 $ 0.03 $ 0.22 $ 0.25 $ 0.25 $ 0.32 $ 0.33 $ 0.70 $ 1.15 $ 1.27
[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.