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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, 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
Quarterly Financial Information [Line Items]                      
Fee revenue $ 251,712 $ 242,184 $ 237,968 $ 228,437 $ 227,902 [1] $ 202,004 $ 196,231 $ 186,694 $ 960,301 $ 812,831 $ 790,505
Operating income 24,480 27,302 23,165 16,661 15,392 [1] 8,706 2,769 17,009 91,608 43,876 82,866
Net income $ 21,211 $ 21,304 $ 18,759 $ 11,417 $ 12,197 [1] $ 9,482 $ 1,196 $ 10,418 $ 72,691 $ 33,293 $ 54,303
Basic $ 0.44 $ 0.44 $ 0.39 $ 0.24 $ 0.26 [1] $ 0.20 $ 0.03 $ 0.22 $ 1.51 $ 0.71 $ 1.17
Diluted $ 0.43 $ 0.43 $ 0.38 $ 0.24 $ 0.25 [1] $ 0.20 $ 0.03 $ 0.22 $ 1.48 $ 0.70 $ 1.15
[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.