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Document and Entity Information
Sep. 13, 2021
Document And Entity Information [Line Items]  
Amendment Flag false
Entity Central Index Key 0001836833
Document Type 8-K
Document Period End Date Sep. 13, 2021
Entity Registrant Name DMY TECHNOLOGY GROUP, INC. IV
Entity Incorporation State Country Code DE
Entity File Number 001-40166
Entity Tax Identification Number 85-4299396
Entity Address, Address Line One 1180 North Town Center Drive
Entity Address, Address Line Two Suite 100
Entity Address, City or Town Las Vegas
Entity Address, State or Province NV
Entity Address, Postal Zip Code 89144
City Area Code (702)
Local Phone Number 781-4313
Written Communications true
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Entity Ex Transition Period false
Units Each Consisting Of One Share Of Class A Common Stock And One Fifth Of One Redeemable Warrant [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Units, each consisting of one share of Class A common stock and one-fifth of one redeemable warrant
Trading Symbol DMYQ.U
Security Exchange Name NYSE
Common Class A [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Class A common stock, par value $0.0001 per share
Trading Symbol DMYQ
Security Exchange Name NYSE
Redeemable Warrants Each Whole Warrant Exercisable For One Share Of Class A Common Stock Each At An Exercise Price Of 11.50 Per Share [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Redeemable warrants, each whole warrant exercisable for one share of Class A common stock, each at an exercise price of $11.50 per share
Trading Symbol DMYQ WS
Security Exchange Name NYSE