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Financial Assets and Liabilities - Fair Value Movement of Contingent Consideration (Details) - 12 months ended Jun. 30, 2018 - Contingent consideration | GBP (£) | $ / shares
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Reconciliation of changes in contingent liabilities recognised in business combination [abstract] |  |
Fair value at 1 July 2017 | £ 0 |
Contingent liabilities recognised as of acquisition date | 10,933,000 |
Movement in fair value recognised in finance cost | 126,000 |
Foreign exchange recognised in other comprehensive income | 255,000 |
Fair value at 30 June 2018 | £ 11,314,000 |
Discounted cash flow | Recurring fair value measurement |  |
Reconciliation of changes in contingent liabilities recognised in business combination [abstract] |  |
Current Period Of Future Cash Outflows To Be Paid To Fulfil Obligation, Significant Unobservable Inputs, Liabilities | 3 years |
Significant unobservable inputs, fair value of ordinary shares | $ / shares |  | $ 12.79
Significant unobservable inputs, discount rate | 3.00% |
Top of range | Discounted cash flow | Recurring fair value measurement |  |
Reconciliation of changes in contingent liabilities recognised in business combination [abstract] |  |
Significant unobservable inputs, expected future cash flows | £ 12,100,000 |
Bottom of range | Discounted cash flow | Recurring fair value measurement |  |
Reconciliation of changes in contingent liabilities recognised in business combination [abstract] |  |
Significant unobservable inputs, expected future cash flows | £ 0 |

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- Definition The amount of contingent liabilities recognised in a business combination. [Refer: Contingent liabilities [member]; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B67 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B67_c&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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- Definition A current estimate using the entity's own data about the future cash outflows to be paid to fulfil an obligation if there is no reasonably available information that indicates that market participants would use different assumptions. This is used as a significant Level 3 unobservable input for liabilities. [Refer: Level 3 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 13 -IssueDate 2017-01-01 -Paragraph B36 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_B36_d&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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- Definition The increase in contingent liabilities recognised in a business combination through adjustments arising from the passage of time. [Refer: Contingent liabilities recognised in business combination; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B67 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B67_c&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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