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

Deferred Compensation and Retirement Plans - Total Long-Term Benefit Obligations (Detail) - USD ($) $ in Thousands	Apr. 30, 2020	Apr. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Total benefit obligation	$ 308,279	$ 275,453
Less: current portion of benefit obligation	(19,143)	(17,818)
Deferred compensation and other retirement plans	289,136	257,635
Deferred Compensation and Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Total benefit obligation	156,586	123,238
Medical and Life Insurance Plan
Defined Benefit Plan Disclosure [Line Items]
Total benefit obligation	7,527	7,310
International Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Total benefit obligation	14,851	14,744
Executive Capital Accumulation Plan
Defined Benefit Plan Disclosure [Line Items]
Total benefit obligation	$ 129,315	$ 130,161