Cover Page - shares	6 Months Ended
	Jun. 30, 2022	Aug. 12, 2022
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Document Quarterly Report	true
Document Transition Report	false
Entity Registrant Name	KENSINGTON CAPITAL ACQUISITION CORP. IV
Entity Central Index Key	0001899287
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Entity Incorporation, State or Country Code	E9
Entity Tax Identification Number	98-1591811
Entity File Number	001-41314
Entity Address, Address Line One	1400 Old Country Road
Entity Address, Address Line Two	Suite 301
Entity Address, City or Town	Westbury
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	11590
City Area Code	703
Local Phone Number	674-6514
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	true
Capital Units [Member]
Document Information [Line Items]
Title of 12(b) Security	Units, each consisting of one Class A ordinary share, $0.0001 par value, one Class 1 redeemable warrant and one Class 2 redeemable warrant
Trading Symbol	KCAC.U
Security Exchange Name	NYSE
Common Class A [Member]
Document Information [Line Items]
Title of 12(b) Security	Class A ordinary shares, $0.0001 par value
Trading Symbol	KCAC
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		23,000,000
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		9,857,142
Class 1 redeemable warrants, each exercisable for one Class A ordinary share
Document Information [Line Items]
Title of 12(b) Security	Class 1 redeemable warrants, each exercisable for one Class A ordinary share at an exercise price of $11.50
Trading Symbol	KCAC.W
Security Exchange Name	NYSE
Class 2 redeemable warrants, each exercisable for one Class A ordinary share
Document Information [Line Items]
Title of 12(b) Security	Class 2 redeemable warrants, each exercisable for one Class A ordinary share at an exercise price of $11.50
Trading Symbol	KCAC.W
Security Exchange Name	NYSE
New units, each consisting of one Class A ordinary share
Document Information [Line Items]
Title of 12(b) Security	New units, each consisting of one Class A ordinary share, $0.0001 par value and one Class 2 redeemable warrant
Trading Symbol	KCA.U
Security Exchange Name	NYSE