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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