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

Fee Revenue - Schedule of Disaggregation of Fee Revenue by Industry (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Disaggregation Of Revenue [Line Items]
Fee Revenue									$ 1,977,330	$ 1,973,862	$ 1,819,519
Industrial
Disaggregation Of Revenue [Line Items]
Fee Revenue									$ 556,189	$ 557,284	$ 529,188
Fee Revenue, Percentage									28.80%	28.90%	30.00%
Life Sciences/ Healthcare
Disaggregation Of Revenue [Line Items]
Fee Revenue									$ 343,955	$ 322,574	$ 295,300
Fee Revenue, Percentage									17.80%	16.70%	16.70%
Financial Services
Disaggregation Of Revenue [Line Items]
Fee Revenue									$ 334,433	$ 348,460	$ 306,216
Fee Revenue, Percentage									17.30%	18.10%	17.30%
Consumer Goods
Disaggregation Of Revenue [Line Items]
Fee Revenue									$ 285,927	$ 295,900	$ 277,904
Fee Revenue, Percentage									14.80%	15.40%	15.70%
Technology
Disaggregation Of Revenue [Line Items]
Fee Revenue									$ 285,562	$ 261,176	$ 226,004
Fee Revenue, Percentage									14.80%	13.60%	12.80%
Education/Non-Profit/General
Disaggregation Of Revenue [Line Items]
Fee Revenue									$ 126,666	$ 140,639	$ 132,605
Fee Revenue, Percentage									6.50%	7.30%	7.50%
Fee Revenue
Disaggregation Of Revenue [Line Items]
Fee Revenue	$ 440,469	$ 515,325	$ 492,389	$ 484,549	$ 490,756	$ 474,504	$ 495,205	$ 465,568	$ 1,932,732	$ 1,926,033	$ 1,767,217
Fee Revenue, Percentage									100.00%	100.00%	100.00%