Cover - shares	3 Months Ended
	Mar. 31, 2024	Apr. 18, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-14875
Entity Registrant Name	FTI CONSULTING, INC
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	52-1261113
Entity Address, Address Line One	555 12th Street NW
Entity Address, City or Town	Washington,
Entity Address, State or Province	DC
Entity Address, Postal Zip Code	20004
City Area Code	202
Local Phone Number	312-9100
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	FCN
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		35,697,614
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Entity Central Index Key	0000887936
Current Fiscal Year End Date	--12-31