CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss, Net	Total Korn Ferry Stockholders' Equity	Noncontrolling Interest
Beginning Balance at Apr. 30, 2019	$ 1,243,387	$ 656,463	$ 660,845	$ (76,652)	$ 1,240,656	$ 2,731
Beginning Balance, Shares at Apr. 30, 2019		56,431
Net income (loss)	43,650		42,951		42,951	699
Other comprehensive (loss) income	(5,398)			(5,462)	(5,462)	64
Dividends paid to shareholders	(6,081)		(6,081)		(6,081)
Purchase of stock	(21,329)	$ (21,329)			(21,329)
Purchase of stock, shares		(546)
Issuance of stock	5,074	$ 5,074			5,074
Issuance of stock (shares)		711
Stock-based compensation	5,091	$ 5,091			5,091
Ending Balance at Jul. 31, 2019	1,264,394	$ 645,299	697,715	(82,114)	1,260,900	3,494
Ending Balance, Shares at Jul. 31, 2019		56,596
Beginning Balance at Apr. 30, 2019	1,243,387	$ 656,463	660,845	(76,652)	1,240,656	2,731
Beginning Balance, Shares at Apr. 30, 2019		56,431
Net income (loss)	86,682
Ending Balance at Oct. 31, 2019	1,258,491	$ 601,686	734,891	(80,646)	1,255,931	2,560
Ending Balance, Shares at Oct. 31, 2019		55,315
Beginning Balance at Jul. 31, 2019	1,264,394	$ 645,299	697,715	(82,114)	1,260,900	3,494
Beginning Balance, Shares at Jul. 31, 2019		56,596
Net income (loss)	43,032		42,804		42,804	228
Other comprehensive (loss) income	1,352			1,468	1,468	(116)
Dividends paid to shareholders	(5,628)		(5,628)		(5,628)
Dividends to noncontrolling interest	(1,046)					(1,046)
Purchase of stock	(49,325)	$ (49,325)			(49,325)
Purchase of stock, shares		(1,313)
Issuance of stock (shares)		32
Stock-based compensation	5,712	$ 5,712			5,712
Ending Balance at Oct. 31, 2019	1,258,491	$ 601,686	734,891	(80,646)	1,255,931	2,560
Ending Balance, Shares at Oct. 31, 2019		55,315
Beginning Balance at Apr. 30, 2020	$ 1,223,691	$ 585,560	742,993	(107,172)	1,221,381	2,310
Beginning Balance, Shares at Apr. 30, 2020	54,450	54,450
Net income (loss)	$ (30,855)		(30,833)		(30,833)	(22)
Other comprehensive (loss) income	25,655			25,580	25,580	75
Dividends paid to shareholders	(5,807)		(5,807)		(5,807)
Purchase of stock	(4,442)	$ (4,442)			(4,442)
Purchase of stock, shares		(161)
Issuance of stock	3,966	$ 3,966			3,966
Issuance of stock (shares)		580
Stock-based compensation	5,813	$ 5,813			5,813
Ending Balance at Jul. 31, 2020	1,218,021	$ 590,897	706,353	(81,592)	1,215,658	2,363
Ending Balance, Shares at Jul. 31, 2020		54,869
Beginning Balance at Apr. 30, 2020	$ 1,223,691	$ 585,560	742,993	(107,172)	1,221,381	2,310
Beginning Balance, Shares at Apr. 30, 2020	54,450	54,450
Net income (loss)	$ (2,777)
Ending Balance at Oct. 31, 2020	$ 1,221,522	$ 575,103	728,524	(83,655)	1,219,972	1,550
Ending Balance, Shares at Oct. 31, 2020	54,153	54,153
Beginning Balance at Jul. 31, 2020	$ 1,218,021	$ 590,897	706,353	(81,592)	1,215,658	2,363
Beginning Balance, Shares at Jul. 31, 2020		54,869
Net income (loss)	28,078		27,778		27,778	300
Other comprehensive (loss) income	(2,061)			(2,063)	(2,063)	2
Dividends paid to shareholders	(5,607)		(5,607)		(5,607)
Dividends to noncontrolling interest	(1,115)					(1,115)
Purchase of stock	(22,878)	$ (22,878)			(22,878)
Purchase of stock, shares		(757)
Issuance of stock (shares)		41
Stock-based compensation	7,084	$ 7,084			7,084
Ending Balance at Oct. 31, 2020	$ 1,221,522	$ 575,103	$ 728,524	$ (83,655)	$ 1,219,972	$ 1,550
Ending Balance, Shares at Oct. 31, 2020	54,153	54,153