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Subsequent Events (Details)	1 Months Ended
	Dec. 31, 2016 item
International Land
Subsequent Event
Number of rigs early termination notice received	5

X

- Definition

The number of rigs which has received termination notice.

+ References

No definition available.

+ Details

Name:	hp_NumberOfRigsForWhichEarlyTerminationNoticeReceived
Namespace Prefix:	hp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=hp_InternationalLandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: