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RISK FACTORS (Details) $ in Millions	12 Months Ended
	Sep. 30, 2015 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: