XML 72 R62.htm IDEA: XBRL DOCUMENT v3.19.1

REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Drilling Services Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
REVENUE FROM CONTRACTS WITH CUSTOMERS
Early termination revenue	$ 1.2	$ 4.0	$ 8.3	$ 8.3

X

- Definition

Revenue related to early termination of contract.

+ References

No definition available.

+ Details

Name:	hp_EarlyTerminationRevenue
Namespace Prefix:	hp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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