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Cover Document
Aug. 28, 2024
Cover [Abstract]  
Document Type 8-K
Document Period End Date Aug. 28, 2024
Entity Registrant Name StoneX Group Inc.
Entity Incorporation, State or Country Code DE
Entity File Number 000-23554
Entity Tax Identification Number 59-2921318
Entity Address, Address Line One 230 Park Ave
Entity Address, Address Line Two 10th Floor
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10169
City Area Code (212)
Local Phone Number 485-3500
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.01 par value
Trading Symbol SNEX
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Entity Central Index Key 0000913760
Amendment Flag false
Current Fiscal Year End Date --09-30