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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 18, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Trading Symbol PRDO    
Title of 12(b) Security Common Stock, $0.01 par value    
Security Exchange Name NASDAQ    
Entity Registrant Name PERDOCEO EDUCATION CORP    
Entity Central Index Key 0001046568    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Common Stock, Shares Outstanding   68,748,662  
Entity Public Float     $ 720,000,000
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Shell Company false    
Document Annual Report true    
Document Transition Report false    
Entity File Number 0-23245    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 36-3932190    
Entity Address, Address Line One 231 N. Martingale Road    
Entity Address, City or Town Schaumburg    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60173    
City Area Code 847    
Local Phone Number 781-3600    
ICFR Auditor Attestation Flag true    
Auditor Firm ID 248    
Auditor Name GRANT THORNTON LLP    
Auditor Location Chicago, Illinois    
Documents Incorporated by Reference

Portions of the Registrant’s Notice of Annual Meeting and Proxy Statement for the Registrant’s 2022 Annual Meeting of Stockholders are incorporated by reference into Part III of this Report.