Revenue from contracts with customers - Assets and liabilities related to contracts with customers (Details) - GBP (£) £ in Thousands	12 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Revenue from contracts with customers
Contract liabilities - deferred revenue at beginning of year	£ (217,597)	£ (243,093)
Recognized in revenue during the year	180,512	203,445
Cash received during the year	(186,415)	(177,949)
Contract liabilities - deferred revenue at end of year	(223,500)	(217,597)
Current contract assets and contract liabilities
Revenue from contracts with customers
Contract assets - accrued revenue at beginning of period	38,018	28,755
Recognized in revenue during the year	39,532	38,018
Cash received during the year	(38,018)	(28,755)
Contract assets - accrued revenue at end of period	39,532	38,018
Contract liabilities - deferred revenue at beginning of year	(180,512)	(203,445)
Recognized in revenue during the year	180,512	203,445
Cash received during the year	(180,494)	(177,426)
Reclassified to current during the year	(9,652)	(3,086)
Contract liabilities - deferred revenue at end of year	(190,146)	(180,512)
Non-current contract assets and contract liabilities
Revenue from contracts with customers
Contract liabilities - deferred revenue at beginning of year	(37,085)	(39,648)
Cash received during the year	(5,921)	(523)
Reclassified to current during the year	9,652	3,086
Contract liabilities - deferred revenue at end of year	£ (33,354)	(37,085)
As previously reported
Revenue from contracts with customers
Contract liabilities - deferred revenue at beginning of year		(246,893)
As previously reported \| Current contract assets and contract liabilities
Revenue from contracts with customers
Contract liabilities - deferred revenue at beginning of year		(207,245)
As previously reported \| Non-current contract assets and contract liabilities
Revenue from contracts with customers
Contract liabilities - deferred revenue at beginning of year		(39,648)
Adjustment
Revenue from contracts with customers
Contract liabilities - deferred revenue at beginning of year		3,800
Adjustment \| Current contract assets and contract liabilities
Revenue from contracts with customers
Contract liabilities - deferred revenue at beginning of year		£ 3,800

The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_105&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
-Paragraph 116
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_116_a&doctype=Standard
-URIDate 2018-03-16

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- Definition

The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

+ References

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- Definition

The decrease in contract liabilities resulting from the performance obligation being satisfied. [Refer: Contract liabilities; Performance obligations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
-Paragraph 118
-Subparagraph e
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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.

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- Definition

Decrease in contract assets through cash received

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- Definition

Increase (decrease) in contract liability through reclassification between current and non-current

+ References

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- Definition

Increase in contract liability through cash received.

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- Definition

Increase in contract assets through revenue recognized

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