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PROPERTY, PLANT AND EQUIPMENT - Schedule of Assets Held-for-Sale (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2022 USD ($)
Change In Assets Held-For-Sale [Roll Forward]
Asset held for sale, beginning balance	$ 71,453
Asset additions	1,459
Sale of assets held-for-sale	(15,539)
Assets held for sale, ending balance	$ 57,373

X

- Definition

Assets Held-For-Sale, Not Part Of Disposal Group, Additions

+ References

No definition available.

+ Details

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

X

- Definition

Assets Held-For-Sale, Not Part Of Disposal Group, Sales

+ References

No definition available.

+ Details

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Namespace Prefix:	hp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Change In Assets Held-For-Sale

+ References

No definition available.

+ Details

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Namespace Prefix:	hp_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=123398962&loc=d3e400-110220

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