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Quarterly Results (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Quarterly Financial Information [Line Items]
Fee revenue	$ 271,717	$ 249,545	$ 255,702	$ 251,188	$ 251,712	$ 242,184	$ 237,968	$ 228,437	$ 1,028,152	$ 960,301	$ 812,831
Operating income	28,092	32,927	34,416	18,593	24,480	27,302	23,165	16,661	114,028	91,608	43,876
Net income	$ 25,482	$ 22,939	$ 25,403	$ 14,533	$ 21,211	$ 21,304	$ 18,759	$ 11,417	$ 88,357	$ 72,691	$ 33,293
Basic	$ 0.51	$ 0.46	$ 0.52	$ 0.30	$ 0.44	$ 0.44	$ 0.39	$ 0.24	$ 1.78	$ 1.51	$ 0.71
Diluted	$ 0.51	$ 0.46	$ 0.51	$ 0.29	$ 0.43	$ 0.43	$ 0.38	$ 0.24	$ 1.76	$ 1.48	$ 0.70

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.