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Dividends - Summary of Dividends Paid (Parenthetical) (Detail) - 5.5% Preference shares [member] - £ / shares	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2022
Disclosure of dividends [line items]
Per cent dividend	5.50%
Preference shares	50,000	0
Par value	£ 1

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- Definition

Disclosure of dividends.

+ References

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- Definition

Preference shares annual dividend percentage.

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- Definition

The number of shares issued by the entity, for which full payment has been received.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2022-03-24
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- Definition

The nominal value per share.

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