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Cover
Feb. 05, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Feb. 05, 2025
Entity File Number 000-23554
Entity Registrant Name StoneX Group Inc.
Entity Central Index Key 0000913760
Entity Tax Identification Number 59-2921318
Entity Incorporation, State or Country Code DE
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