Number Of Letters Of Credit Outstanding

No definition available.

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Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

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

+ References

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+ Details

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

- Definition

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

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
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

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
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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+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

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Period Type:	duration

- Details

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- Details

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- Details

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- Details

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- Details

Name:	us-gaap_DebtInstrumentAxis=hp_A2018CreditFacilityDueNovember2025Member
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- Details

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- Details

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DEBT - Narrative (Details)	3 Months Ended
DEBT - Narrative (Details)	Dec. 31, 2021 USD ($) letter_of_credit	Sep. 29, 2021 USD ($)	Sep. 27, 2021	Apr. 16, 2021 USD ($)	Dec. 20, 2018 USD ($)	Nov. 13, 2018 USD ($)
Letters of Credit
Debt Instrument [Line Items]
Number of letters of credit outstanding \| letter_of_credit	5
Letters of credit outstanding	$ 30,400,000
Unsecured Senior Notes Issued 2031
Debt Instrument [Line Items]
Interest rate		2.90%
Face amount of debt		$ 550,000,000
Unsecured Senior Notes Issued 2025
Debt Instrument [Line Items]
Interest rate			4.65%
Face amount of debt					$ 487,100,000
Make-whole premium and accrued interest	56,400,000
Loss on extinguishment of debt	3,700,000
2018 Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 750,000,000
Borrowings outstanding	0
Available borrowing capacity	750,000,000
2018 Credit Facility \| Letters of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 75,000,000
2018 Credit Facility, Due November 2025
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 680,000,000
2018 Credit Facility, Due November 2024
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 70,000,000
Unsecured Standalone Line of Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	20,000,000
Borrowings outstanding	$ 5,800,000