Borrowings - Schedule of Borrowings (Parenthetical) (Detail) $ in Millions	3 Months Ended
Sep. 30, 2018 USD ($)
New Foxtel [Member]
Debt and Financial Instruments [Line Items]
Undrawn commitments	$ 251
Percentage of applicable margin payable as commitment fee	40% to 45% of the applicable margin
Minimum [Member] \| Australian BBSY [Member]
Debt and Financial Instruments [Line Items]
Interest rate margin	1.10%
Maximum [Member] \| Australian BBSY [Member]
Debt and Financial Instruments [Line Items]
Interest rate margin	2.70%
REA Group [Member] \| Minimum [Member]
Debt and Financial Instruments [Line Items]
Interest rate margin	0.85%
REA Group [Member] \| Minimum [Member] \| Australian BBSY [Member]
Debt and Financial Instruments [Line Items]
Interest rate margin	0.85%
REA Group [Member] \| Maximum [Member]
Debt and Financial Instruments [Line Items]
Interest rate margin	1.05%
REA Group [Member] \| Maximum [Member] \| Australian BBSY [Member]
Debt and Financial Instruments [Line Items]
Interest rate margin	1.45%

Debt and Financial Instruments [Line Items]

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Description of the fees for amounts available, but unused under the credit facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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