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Cover Page - shares
 9 Months Ended
Sep. 30, 2021
Nov. 24, 2021
Entity Information [Line Items]    
Document Type 10-Q/A  
Amendment Flag true  
Document Period End Date Sep. 30, 2021  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q3  
Entity Registrant Name DMY TECHNOLOGY GROUP, INC. IV  
Entity Central Index Key 0001836833  
Current Fiscal Year End Date --12-31  
Document Quarterly Report true  
Document Transition Report false  
Entity Incorporation, State or Country Code DE  
Entity File Number 001-40166  
Entity Tax Identification Number 85-2992192  
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  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Shell Company true  
Entity Ex Transition Period false  
Amendment Description EXPLANATORY NOTE References throughout this Amendment No. 1 to the Quarterly Report on Form 10-Q to “we,” “us,” the “Company” or “our company” are to dMY Technology Group, Inc. IV, unless the context otherwise indicates. This Amendment No. 1 (“Amendment No. 1”) to the Quarterly Report on Form 10-Q/A amends the Quarterly Report on Form 10-Q of dMY Technology Group, Inc. IV (the “Company”) as of and for the period ended September 30, 2021, as filed with the Securities and Exchange Commission (“SEC”) on November 15, 2021. On November 15, 2021, the Company filed its Form 10-Q for the quarterly period ending September 30, 2021 (the “Q3 Form 10-Q”), which included a Note 2, Revision of Previously Issued Financial Statements, (“Note 2”) that describes a revision to the Company’s classification of its Class A common stock subject to redemption issued as part of the units sold in the Company’s initial public offering (“IPO”) on March 9, 2021. As described in Note 2, upon its IPO, the Company classified a portion of the Class A common stock as permanent equity to maintain net tangible assets greater than $5,000,000 on the basis that the Company will consummate its initial business combination only if the Company has net tangible assets of at least $5,000,001. The Company’s management re-evaluated the conclusion and determined that the Class A common stock subject to redemption included certain provisions that require classification of the Class A common stock as temporary equity regardless of the minimum net tangible assets required to complete the Company’s initial business combination. As a result, management corrected the error by restating all Class A common stock subject to redemption as temporary equity. This resulted in an adjustment to the initial carrying value of the Class A common stock subject to possible redemption with the offset recorded to additional paid-in capital (to the extent available), accumulated deficit and Class A common stock. In connection with the change in presentation for the Class A common stock subject to possible redemption, the Company revised its earnings per share calculation to allocate income and losses shared pro rata between the two classes of shares. This presentation differs from the previously presented method of earnings per share, which was similar to the two-class method. The Company determined the changes were not qualitatively material to the Company’s previously issued financial statements and did not restate its financial statements. Instead, the Company revised its previously financial statements in Note 2 to its Q3 Form 10-Q. Although the qualitative factors that management assessed tended to support a conclusion that the misstatements were not material, these factors were not strong enough to overcome the significant quantitative errors in the financial statements. The qualitative and quantitative factors support a conclusion that the misstatements are material on a quantitative basis. Management concluded that the misstatement was such of magnitude that it is probable that the judgment of a reasonable person relying upon the financial statements would have been influenced by the inclusion or correction of the foregoing items. As such, upon further consideration of the change, the Company determined the change in classification of the Class A common stock and change to its presentation of earnings per share is material quantitatively and it should restate its previously issued financial statements. Therefore, on November 24, 2021, the Company’s management and the audit committee of the Company’s board of directors (the “Audit Committee”), after discussing with WithumSmith+Brown, PC, the Company’s independent registered public accounting firm, concluded that the Company’s previously issued (i) audited balance sheet as of March 9, 2021, as previously revised in the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2021, as filed in Form 8-K with the SEC on March 15, 2021, (ii) unaudited interim financial statements included in the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2021, filed with the SEC on June 4, 2021, (iii) unaudited interim financial statements included in the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2021, filed with the SEC on August 16, 2021, and (iv) footnote 2 to the unaudited interim financial statements and Item 4 of Part I included in the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2021, filed with the SEC on November 15, 2021 (collectively, the “Affected Periods”), should be restated to report all Public Shares as temporary equity and should no longer be relied upon. As such, the Company will restate its financial statements for the Affected Periods in this Quarterly Report on Form 10-Q/A. The Company does not expect any of the above changes will have any impact on its cash position and cash held in the trust account established in connection with the IPO. After re-evaluation, the Company’s management has concluded that in light of the errors described above, a material weakness existed in the Company’s internal control over financial reporting during the Affected Periods and that the Company’s disclosure controls and procedures were not effective. The Company’s remediation plan with respect to such material weakness is described in more detail in Item 4 to Part 1 of this filing.  
Capital Units [Member]    
Entity Information [Line Items]    
Trading Symbol DMYQ.U  
Title of 12(b) Security Units, each consisting of one share of Class A common stock and one-fifth of one redeemable warrant  
Security Exchange Name NYSE  
Common Class A [Member]    
Entity Information [Line Items]    
Trading Symbol DMYQ  
Title of 12(b) Security Class A common stock, par value $0.0001 per share  
Security Exchange Name NYSE  
Entity Common Stock, Shares Outstanding   34,500,000
Warrant [Member]    
Entity Information [Line Items]    
Trading Symbol DMYQ WS  
Title of 12(b) Security Warrants, each whole warrant exercisable for one share of Class A common stock, each at an exercise price of $11.50 per share  
Security Exchange Name NYSE  
Common Class B [Member]    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding   8,625,000