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Cover Page - shares
 3 Months Ended
Dec. 31, 2019
Jan. 28, 2020
Cover page.    
Document Type 10-Q  
Document Fiscal Period Focus Q1  
Document Quarterly Report true  
Document Period End Date Dec. 31, 2019  
Document Transition Report false  
Amendment Flag false  
Document Fiscal Year Focus 2020  
Current Fiscal Year End Date --09-30  
Entity File Number 1-4221  
Entity Registrant Name HELMERICH & PAYNE, INC.  
Entity Central Index Key 0000046765  
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 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   108,877,646