Annual report pursuant to Section 13 and 15(d)

Fee Revenue Classified by Country (Detail)

v2.4.0.6
Fee Revenue Classified by Country (Detail) (USD $)
In Thousands, 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
Segment Reporting Information [Line Items]                      
Fee revenue $ 227,902 [1] $ 202,004 $ 196,231 $ 186,694 $ 198,087 $ 185,951 $ 200,136 $ 206,331 $ 812,831 $ 790,505 $ 744,249
UNITED STATES
                      
Segment Reporting Information [Line Items]                      
Fee revenue                 416,987 383,955 365,919
Other Countries
                      
Segment Reporting Information [Line Items]                      
Fee revenue                 $ 395,844 $ 406,550 $ 378,330
[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.