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Quarterly Results (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Quarterly Financial Information [Line Items]
Fee revenue	$ 475,364	$ 447,581	$ 443,018	$ 401,254	$ 406,065	$ 381,918	$ 401,917	$ 375,621	$ 1,767,217	$ 1,565,521	$ 1,292,112
Operating income	63,281	48,622	51,244	40,737	32,834	30,542	46,548	4,516	203,884	114,440	52,692
Net income	42,309	27,427	36,732	29,429	27,736	24,378	31,056	4,068	135,897	87,238	31,433
Net income attributable to Korn/Ferry International	$ 41,160	$ 27,247	$ 36,331	$ 29,041	$ 26,924	$ 23,897	$ 30,152	$ 3,208	$ 133,779	$ 84,181	$ 30,913
Basic	$ 0.74	$ 0.49	$ 0.65	$ 0.52	$ 0.48	$ 0.42	$ 0.53	$ 0.06	$ 2.39	$ 1.48	$ 0.58
Diluted	$ 0.73	$ 0.48	$ 0.64	$ 0.51	$ 0.47	$ 0.42	$ 0.52	$ 0.06	$ 2.35	$ 1.47	$ 0.58

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