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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Self-Insurance (Details) $ in Millions	9 Months Ended
	Jun. 30, 2019 USD ($)
Minimum
Unusual Risk or Uncertainty [Line Items]
Insurance coverage deductibles range for claims which occur outside or inside the United States	$ 1
Maximum
Unusual Risk or Uncertainty [Line Items]
Insurance coverage deductibles range for claims which occur outside or inside the United States	$ 5

X

- Definition

Represents the deductible amounts of claims that are covered by insurance.

+ References

No definition available.

+ Details

Name:	hp_SelfInsuranceCoverageDeductiblesRangeForClaimsIncurred
Namespace Prefix:	hp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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_UnusualRiskOrUncertaintyLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: