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Auditor's Remuneration - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Auditors remuneration [Line Items] |  |  |
Tax compliance services | $ 657 | $ 631 | $ 1,091
Tax compliance services [member] |  |  |
Auditors remuneration [Line Items] |  |  |
Tax compliance services | $ 0 | $ 27 | $ 89

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- Definition Auditors remuneration. + References No definition available. + Details
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Namespace Prefix: | bhp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of fees paid or payable to the entity's auditors for services that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | bhp_AuditorsAxis=bhp_TaxComplianceServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |