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, 2019	Apr. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Total benefit obligation	$ 275,453	$ 249,720
Less: current portion of benefit obligation	(17,818)	(21,991)
Deferred compensation and other retirement plans	257,635	227,729
Deferred Compensation and Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Total benefit obligation	123,238	100,404
Medical and Life Insurance Plan
Defined Benefit Plan Disclosure [Line Items]
Total benefit obligation	7,310	7,157
International Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Total benefit obligation	14,744	13,729
Executive Capital Accumulation Plan
Defined Benefit Plan Disclosure [Line Items]
Total benefit obligation	$ 130,161	$ 128,430