XML 8 R1.htm IDEA: XBRL DOCUMENT v3.25.3
Cover - shares
 9 Months Ended
Sep. 30, 2025
Nov. 10, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2025  
Document Transition Report false  
Entity File Number 001-42789  
Entity Registrant Name Firefly Aerospace Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 81-5194980  
Entity Address, Address Line One 1320 Arrow Point Drive #109  
Entity Address, City or Town Cedar Park  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 78613  
City Area Code 512  
Local Phone Number 893-5570  
Title of 12(b) Security Common Stock, $0.0001 par value  
Trading Symbol FLY  
Security Exchange Name NASDAQ  
Entity Current Reporting Status No  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   159,251,122
Entity Central Index Key 0001860160  
Amendment Flag false  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2025  
Current Fiscal Year End Date --12-31