Korn Ferry Annual report pursuant to Section 13 and 15(d)

Segments - Fee Revenue Classified by Country (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Segment Reporting Information [Line Items]
Total revenue									$ 1,973,862	$ 1,819,519	$ 1,621,669
Fee Revenue
Segment Reporting Information [Line Items]
Total revenue	$ 490,756	$ 474,504	$ 495,205	$ 465,568	$ 475,364	$ 447,581	$ 443,018	$ 401,254	1,926,033	1,767,217	1,565,521
Fee Revenue \| UNITED STATES
Segment Reporting Information [Line Items]
Total revenue									859,969	778,470	728,871
Fee Revenue \| United Kingdom
Segment Reporting Information [Line Items]
Total revenue									202,055	176,091	145,551
Fee Revenue \| Other Countries
Segment Reporting Information [Line Items]
Total revenue									$ 864,009	$ 812,656	$ 691,099