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Employee Share Ownership Plans - Summary of Description of Plans (Parenthetical) (Detail)	12 Months Ended
	Jun. 30, 2019 USD ($)
STIP and GSTIP [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	2 years
Shareplus [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	3 years
Maximum employee contributions to acquire shares	$ 5,000
Long-Term Incentive Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage per year	5.50%
Vesting period	5 years
Vesting percentage	100.00%
Long-Term Incentive Plan [member] | Peer Group Total Shareholder Return [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage	67.00%
Long-Term Incentive Plan [member] | Index Total Shareholder Return [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage	33.00%
Long-Term Incentive Plan [member] | Median Total Shareholder Return [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting percentage	25.00%
Bottom of range [member] | Transitional OMC awards [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	3 years
Bottom of range [member] | MAP awards [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	1 year
Top of range [member] | Transitional OMC awards [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	4 years
Top of range [member] | MAP awards [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	5 years

X

- Definition

Maximum contributions of employee to acquire shares in share based arrangement plans.

+ References

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+ Details

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X

- Definition

Share-based payments vesting period.

+ References

No definition available.

+ Details

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X

- Definition

Vesting percentage.

+ References

No definition available.

+ Details

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- Definition

Vesting percentage per year.

+ References

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+ Details

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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