Debt Instrument, Basis Spread on Variable Rate, Conditional on Borrowings Outstanding

No definition available.

Name:	hp_DebtInstrumentBasisSpreadOnVariableRateConditionalOnBorrowingsOutstanding
Namespace Prefix:	hp_
Data Type:	xbrli:pureItemType
Balance Type:	na
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- Definition

Debt Instrument, Interest Rate, Potential Special Additional Interest

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Percentage of total debt to total capitalization of the entity.

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Term, Period After Funding

+ References

No definition available.

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- Definition

Line Of Credit Facility Accordion Increase

+ References

No definition available.

+ Details

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

- Definition

Line of Credit Facility, Commitment Fees, Conditional on Borrowings Outstanding

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility Maturity Renewal Term

+ References

No definition available.

+ Details

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Namespace Prefix:	hp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit, Number of Loan Extensions

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the maximum percentage of priority debt that can be allowed on the net worth of the entity.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Payment For Debt Extinguishment Or Debt Prepayment Cost, Including Accrued Interest

+ References

No definition available.

+ Details

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

- Definition

Revolving Commitments Under Amended Credit Facility Expire

+ References

No definition available.

+ Details

Name:	hp_RevolvingCommitmentsUnderAmendedCreditFacilityExpire
Namespace Prefix:	hp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Revolving Commitments Under Amended Credit Facility Mature

+ References

No definition available.

+ Details

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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

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Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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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.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Balance Type:	na
Period Type:	duration

- Definition

Interest and debt related expenses associated with nonoperating financing activities of the entity.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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- Definition

Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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DEBT - Narrative (Details)			3 Months Ended	12 Months Ended
DEBT - Narrative (Details)	Sep. 17, 2024 USD ($)	Aug. 14, 2024 USD ($) extension	Dec. 31, 2021 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 29, 2021 USD ($)	Dec. 20, 2018 USD ($)
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 335,300,000
Commitment fees				10,600,000
Revolving commitments under amended credit facility expire		$ 775,000,000
Credit facility maturity term		1 year
Bridge Loan
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 2,000,000,000
Long-term debt, term				364 days
Commitment fees				$ 1,400,000
Interest expense				$ 9,200,000
Secured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 400,000,000
Debt term after funding				2 years
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		950,000,000
Revolving commitments under amended credit facility mature		$ 175,000,000
Line of credit, number of loan extensions \| extension		2
Line of credit facility accordion increase		$ 100,000,000
Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage				101.00%
Debt instrument, interest rate, potential special additional interest	0.0025
Notes \| Senior Notes
Debt Instrument [Line Items]
Face amount of debt	$ 1,250,000,000
Unsecured Senior Notes Due 2027 \| Senior Notes
Debt Instrument [Line Items]
Face amount of debt	$ 350,000,000
Interest rate (as a percent)	4.65%
Debt instrument, redemption price, percentage	99.958%
Unsecured Senior Notes Due 2029 \| Senior Notes
Debt Instrument [Line Items]
Face amount of debt	$ 350,000,000
Interest rate (as a percent)	4.85%
Debt instrument, redemption price, percentage	99.883%
Unsecured Senior Notes due Due December 1, 2029
Debt Instrument [Line Items]
Long-term debt				$ 350,000,000	$ 0
Unsecured Senior Notes Due 2034 \| Senior Notes
Debt Instrument [Line Items]
Face amount of debt	$ 550,000,000
Interest rate (as a percent)	5.50%
Debt instrument, redemption price, percentage	99.67%
Unsecured Senior Notes due Due December 1, 2034
Debt Instrument [Line Items]
Long-term debt				550,000,000	0
Unsecured Senior Notes due March 19, 2025
Debt Instrument [Line Items]
Face amount of debt							$ 487,100,000
Interest rate (as a percent)							4.65%
Make-whole premium and accrued interest			$ 56,400,000
Write-off of unamortized discount and debt issuance costs			$ 3,700,000
Unsecured Senior Notes due September 29, 2031
Debt Instrument [Line Items]
Face amount of debt						$ 550,000,000.0
Interest rate (as a percent)						2.90%
Long-term debt				$ 550,000,000	$ 550,000,000
Term Loan Credit Facility
Debt Instrument [Line Items]
Line of credit facility, commitment fees, if debt was issued				0.00175
Term Loan Credit Facility \| Adjusted Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate spread		0.10%
Term Loan Credit Facility \| Fed Funds Effective Rate Overnight Index Swap Rate
Debt Instrument [Line Items]
Interest rate spread		0.50%
Term Loan Credit Facility \| One Month Adjusted Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate spread		1.00%
Term Loan Credit Facility \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate, if debt was issued				0.01375
Term Loan Credit Facility \| Minimum
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage		0.10%
Term Loan Credit Facility \| Minimum \| Secured Overnight Financing Rate (SOFR) SOFR Applicable Margin Rate
Debt Instrument [Line Items]
Interest rate spread		1.00%
Term Loan Credit Facility \| Minimum \| Adjusted Base Rate, Applicable Margin Rate
Debt Instrument [Line Items]
Interest rate spread		0.00%
Term Loan Credit Facility \| Maximum
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage		0.25%
Term Loan Credit Facility \| Maximum \| Secured Overnight Financing Rate (SOFR) SOFR Applicable Margin Rate
Debt Instrument [Line Items]
Interest rate spread		1.625%
Term Loan Credit Facility \| Maximum \| Adjusted Base Rate, Applicable Margin Rate
Debt Instrument [Line Items]
Interest rate spread		0.625%
2018 Credit Facility
Debt Instrument [Line Items]
Commitment fee rate				0.15%
Maximum limit of priority debt on net worth		17.50%
Borrowings outstanding				$ 0
Available borrowing capacity				$ 950,000,000.0
2018 Credit Facility \| Fed Funds Effective Rate Overnight Index Swap Rate
Debt Instrument [Line Items]
Interest rate spread		50.00%
2018 Credit Facility \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate spread		10.00%
Spread over SOFR				1.25%
2018 Credit Facility \| Minimum
Debt Instrument [Line Items]
Commitment fee rate		0.075%
2018 Credit Facility \| Minimum \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate spread		0.875%
2018 Credit Facility \| Minimum \| One Month Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Interest rate spread		100.00%
2018 Credit Facility \| Minimum \| Base Rate
Debt Instrument [Line Items]
Interest rate spread		0.00%
2018 Credit Facility \| Maximum
Debt Instrument [Line Items]
Commitment fee rate		0.20%
Total debt to total capitalization ratio		55.00%
2018 Credit Facility \| Maximum \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate spread		1.50%
2018 Credit Facility \| Maximum \| Base Rate
Debt Instrument [Line Items]
Interest rate spread		50.00%
Unsecured Standalone Line of Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 160,000,000.0
Borrowings outstanding				39,700,000
Letter of Credit - Instrument 1 \| Letters of Credit
Debt Instrument [Line Items]
Letters of credit outstanding				5,000,000.0
Letter of Credit - Instrument 3 \| Letters of Credit
Debt Instrument [Line Items]
Letters of credit outstanding				$ 44,700,000