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COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2024 USD ($) renewalOption	Sep. 30, 2023 USD ($)
Other Commitments [Line Items]
Operating lease right-of-use assets	$ 59,730	$ 50,400
Leases renewed | renewalOption	1
Purchase commitments for equipment, parts and supplies	$ 153,200
Tulsa Industrial Facility
Other Commitments [Line Items]
Number of renewal options | renewalOption	2
Renewal option term	5 years
Land and Building
Other Commitments [Line Items]
Operating lease, liability	$ 18,100
Operating lease right-of-use assets	$ 18,100

X

- Definition

Lessee Operating Lease, Number Of Options Extended

+ References

No definition available.

+ Details

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Namespace Prefix:	hp_
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Balance Type:	na
Period Type:	duration

X

- Definition

Lessee Operating Lease, Number Of Options To Extend

+ References

No definition available.

+ Details

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Namespace Prefix:	hp_
Data Type:	xbrli:integerItemType
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X

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-1

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-1

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- 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.

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- Details

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- Details

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