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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2024
Feb. 11, 2025
Jun. 28, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Trading Symbol PAYC    
Entity Registrant Name Paycom Software, Inc.    
Entity Central Index Key 0001590955    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   57,264,718  
Entity Public Float     $ 7.2
Title of 12(b) Security Common Stock, $0.01 par value    
Security Exchange Name NYSE    
Entity File Number 001-36393    
Entity Tax Identification Number 80-0957485    
Entity Address, Address Line One 7501 W. Memorial Road    
Entity Address, City or Town Oklahoma City    
Entity Address, State or Province OK    
Entity Incorporation, State or Country Code DE    
Entity Address, Postal Zip Code 73142    
City Area Code 405    
Local Phone Number 722-6900    
Entity Interactive Data Current Yes    
Document Annual Report true    
Document Transition Report false    
Auditor Firm ID 248    
Auditor Name GRANT THORNTON LLP    
Auditor Location Oklahoma City, Oklahoma    
Auditor Opinion [Text Block]

Basis for opinion

These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s consolidated financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

    
Documents Incorporated by Reference

Portions of the registrant’s Definitive Proxy Statement on Schedule 14A to be furnished to stockholders in connection with its 2025 Annual Meeting of Stockholders are incorporated by reference in Part III, Items 10-14 of this Annual Report on Form 10-K.

    
Document Financial Statement Error Correction [Flag] false