Cover - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 17, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-10485
Entity Registrant Name	TYLER TECHNOLOGIES, INC.
Entity Incorporation, State	DE
Entity Tax Identification Number	75-2303920
Entity Address, Street	5101 Tennyson Parkway
Entity Address, City	Plano,
Entity Address, State	TX
Entity Address, Postal Zip Code	75024
City Area Code	972
Local Phone Number	713-3700
Title of each class	COMMON STOCK, $0.01 PAR VALUE
Trading symbol	TYL
Name of each exchange on which registered	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
ICFR Auditor Attestation Flag	true
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 Public Float			$ 13,728,101,720
Entity Common Stock, Shares Outstanding		40,576,730
Documents Incorporated by Reference	Certain information required by Part III of this annual report is incorporated by reference from the registrant’s definitive proxy statement for its annual meeting of stockholders to be held on May 11, 2021.
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0000860731