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, 2017	Apr. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Total benefit obligation	$ 231,348	$ 234,059
Less: current portion of benefit obligation	(11,443)	(17,946)
Non-current benefit obligation	219,905	216,113
Deferred Compensation and Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Total benefit obligation	95,596	99,699
Medical and Life Insurance Plan
Defined Benefit Plan Disclosure [Line Items]
Total benefit obligation	12,147	13,006
International Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Total benefit obligation	12,021	15,678
Executive Capital Accumulation Plan
Defined Benefit Plan Disclosure [Line Items]
Total benefit obligation	$ 111,584	$ 105,676