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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Jul. 31, 2023 | Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract] |  |
Purchase commitments for equipment, parts and supplies |  | $ 130.7
Settlement amount | $ 19.5 |
Insurance deductible |  | $ 3.0

X
- Definition Loss Contingency, Insurance Deductible + References No definition available. + Details
Name: | hp_LossContingencyInsuranceDeductible
Namespace Prefix: | hp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant