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NATURE OF OPERATIONS (Details)	6 Months Ended
NATURE OF OPERATIONS (Details)	Mar. 31, 2019 location
NATURE OF OPERATIONS
Number of international locations	4

X

- Definition

The number of international locations.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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