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Cover - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Nov. 08, 2021
Mar. 31, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2021    
Document Transition Report false    
Entity File Number 1-4221    
Entity Registrant Name HELMERICH & PAYNE, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 73-0679879    
Entity Address, Address Line One 1437 South Boulder Avenue, Suite 1400    
Entity Address, City or Town Tulsa    
Entity Address, State or Province OK    
Entity Address, Postal Zip Code 74119    
City Area Code 918    
Local Phone Number 742-5531    
Title of 12(b) Security Common Stock ($0.10 par value)    
Trading Symbol HP    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 2,910
Entity Common Stock, Shares Outstanding   108,002,263  
Documents Incorporated by Reference Portions of the Registrant’s 2022 Proxy Statement for the Annual Meeting of Stockholders to be held in calendar year 2022 are incorporated by reference into Part III of this Form 10‑K. The 2022 Proxy Statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this Form 10‑K relates.    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Current Fiscal Year End Date --09-30    
Entity Central Index Key 0000046765