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Subsequent Events (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Subsequent Event |  |  |  |  |
Early termination revenue |  | $ 80.7 | $ 93.0 | $ 189.2 | $ 188.8
Subsequent Event. |  |  |  |  |
Subsequent Event |  |  |  |  |
Early termination revenue | $ 30.0 |  |  |  |

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- 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

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- 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

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |