Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2021	Nov. 10, 2021
Document Information [Line Items]
Document Type	10-Q/A
Amendment Flag	true
Amendment Description	References throughout this Amendment No. 1 to the Quarterly Report on Form 10-Q/A to “we,” “us,” the “Company” or “our company” are to Spartan Acquisition Corp. III, a Delaware corporation, unless the context otherwise indicates.
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2021
Document Fiscal Year Focus	2021
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001838527
Entity File Number	001-40022
Entity Registrant Name	Spartan Acquisition Corp. III
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	86-1182458
Entity Address, Address Line One	9 West 57th Street, 43rd Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10019
City Area Code	212
Local Phone Number	515-3200
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	true
Units
Document Information [Line Items]
Title of 12(b) Security	Units, each consisting of one share of Class A common stock and one-fourth of one warrant
Trading Symbol	SPAQ.U
Security Exchange Name	NYSE
Class A Common Stock
Document Information [Line Items]
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Trading Symbol	SPAQ
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		55,200,000
Warrants
Document Information [Line Items]
Title of 12(b) Security	Warrants, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50 per share
Trading Symbol	SPAQ.WS
Security Exchange Name	NYSE
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		13,800,000

Spartan Acquisition Corp. III 10-Q/A