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Quarterly Results (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2010
Jul. 31, 2010
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2010
Quarterly Results [Abstract]                      
Fee revenue $ 198,087 $ 185,951 $ 200,136 $ 206,331 $ 197,298 $ 186,489 $ 185,350 $ 175,112 $ 790,505 $ 744,249 $ 572,380
Operating income 15,352 16,165 25,407 25,942 26,246 20,492 19,775 19,272 82,866 85,785 (2,722)
Net income $ 12,028 $ 11,717 $ 15,147 $ 15,411 $ 20,339 $ 13,975 $ 13,656 $ 10,904 $ 54,303 $ 58,874 $ 5,298
Basic $ 0.26 $ 0.25 $ 0.33 $ 0.34 $ 0.45 $ 0.31 $ 0.30 $ 0.24 $ 1.17 $ 1.30 $ 0.12
Diluted $ 0.25 $ 0.25 $ 0.32 $ 0.33 $ 0.43 $ 0.30 $ 0.30 $ 0.24 $ 1.15 $ 1.27 $ 0.12