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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Narrative (Details) | 9 Months Ended
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Jun. 30, 2026
Segment Reporting [Abstract] |
Number of reportable segments disclosed by definition flag | reportable operating segment

X
- Definition Number Of Reportable Segments Disclosed By Definition Flag + References No definition available. + Details
Name: | hp_NumberOfReportableSegmentsDisclosedByDefinitionFlag
Namespace Prefix: | hp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration