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RISK FACTORS (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2016 USD ($)
Period for which cumulative inflation rates used for considering country as highly inflationary | 3 years
Minimum |
Insurance coverage deductibles range for claims which occur outside or inside the United States | $ 1
Cumulative inflation rate before a country is considered highly inflationary (as a percent) | 100.00%
Maximum |
Insurance coverage deductibles range for claims which occur outside or inside the United States | $ 3

X
- Definition Represents the cumulative inflation rate before a country is considered highly inflationary. + References No definition available. + Details
Name: | hp_CumulativeInflationRateBeforeConsideredHighlyInflationary
Namespace Prefix: | hp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period over which cumulative inflation rates are used in considering whether a country is highly inflationary. + References No definition available. + Details
Name: | hp_PeriodForWhichCumulativeInflationRatesUsedForConsideringCountryAsHighlyInflationary
Namespace Prefix: | hp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |