XML 29 R72.htm IDEA: XBRL DOCUMENT
v3.19.3

SHAREHOLDERS' EQUITY - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 01, 2018
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |  |
Balance | $ 4,382,735 | $ 4,164,591 | $ 4,560,925 |
Amounts reclassified from accumulated other comprehensive loss | (11,875) |  |  |
Net current-period other comprehensive loss | (11,875) | 14,250 | 2,504 |
Balance | 4,012,223 | 4,382,735 | 4,164,591 |
Adoption of ASU 2016-01 |  |  |  |
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |  |
Adoption of ASU |  |  |  | $ 0
Adoption of ASU 2018-02 |  |  |  |
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |  |
Adoption of ASU |  |  |  | 0
Unrealized Appreciation on Equity Securities |  |  |  |
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |  |
Balance | 29,071 |  |  |
Adjusted balance |  |  |  | 0
Amounts reclassified from accumulated other comprehensive loss | 0 |  |  |
Net current-period other comprehensive loss | 0 |  |  |
Balance | 0 | 29,071 |  |
Unrealized Appreciation on Equity Securities | Adoption of ASU 2016-01 |  |  |  |
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |  |
Adoption of ASU |  |  |  | (29,071)
Unrealized Appreciation on Equity Securities | Adoption of ASU 2018-02 |  |  |  |
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |  |
Adoption of ASU |  |  |  | 0
Defined Benefit Pension Plan |  |  |  |
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |  |
Balance | (12,521) |  |  |
Adjusted balance |  |  |  | (16,760)
Amounts reclassified from accumulated other comprehensive loss | (11,875) |  |  |
Net current-period other comprehensive loss | (11,875) |  |  |
Balance | (28,635) | (12,521) |  |
Defined Benefit Pension Plan | Adoption of ASU 2016-01 |  |  |  |
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |  |
Adoption of ASU |  |  |  | 0
Defined Benefit Pension Plan | Adoption of ASU 2018-02 |  |  |  |
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |  |
Adoption of ASU |  |  |  | (4,239)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |  |
Balance | 16,550 | 2,300 | (204) |
Adjusted balance |  |  |  | (16,760)
Net current-period other comprehensive loss | (11,875) | 14,250 | 2,504 |
Balance | $ (28,635) | $ 16,550 | $ 2,300 |
Accumulated Other Comprehensive Income (Loss) | Adoption of ASU 2016-01 |  |  |  |
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |  |
Adoption of ASU |  |  |  | (29,071)
Accumulated Other Comprehensive Income (Loss) | Adoption of ASU 2018-02 |  |  |  |
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |  |
Adoption of ASU |  |  |  | $ (4,239)

X
- Definition Stockholders' Equity Attributable To Parent, After New Accounting Pronouncements, Adjustment Balance + References No definition available. + Details
Name: | hp_StockholdersEquityAttributableToParentAfterNewAccountingPronouncementsAdjustmentBalance
Namespace Prefix: | hp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_AOCIAttributableToParentNetOfTaxRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581 + Details
Name: | us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_StockholdersEquity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201601Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201802Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedOtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |