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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2024
Revenue from Contract with Customer [Abstract] |  |  |
Revenue from performance contracts | $ 305.8 | $ 298.2 |
Performance bonuses recognized | 16.9 | 15.2 |
Early termination revenue | 1.4 | $ 5.4 |
Capitalized fulfillment costs | $ 29.9 |  | $ 19.2

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- Definition ContractWithCustomerLiabilityRevenueRecognizedIncludingOpeningBalance + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Contract with Customer Liability Revenue Recognized Including Opening Balance on Achievement of Performance Targets + References No definition available. + Details
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- Definition Early Termination Revenue + References No definition available. + Details
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Namespace Prefix: | hp_
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Balance Type: | credit
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-3 + Details
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Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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