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Acquisition of Subsidiaries - Acquisition Date Fair Values of Each Major Class of Consideration Transferred (Details) £ in Thousands, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 GBP (£) shares | Dec. 29, 2017 GBP (£) employee | Dec. 29, 2017 USD ($) employee | Jun. 30, 2017 | Sep. 02, 2016 GBP (£) employee
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Percentage of contingent consideration per payment installment, prior to IPO | 33.33% |  |  |  |
Velocity Partners |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Number of employees | employee |  | 527 | 527 |  |
Initial cash consideration |  | £ 28,586 |  |  |
Fair value of deferred consideration |  | 4,198 |  |  |
Fair value of contingent consideration |  | 10,933 |  |  |
Fair value of tax refund consideration |  | 1,170 |  |  |
Total consideration transferred |  | 44,887 |  |  |
Weighted average trading price measurement period following the IPO event | 30 days |  |  |  |
Contingent consideration payment period | 3 years |  |  |  |
Maximum number of shares issuable on IPO (in shares) | shares | 1,125,035 |  |  |  |
Additional consideration which may be required to supplement equity issuance | £ 12,100 |  |  |  |
Tax refund consideration due to former equity holders |  | 1,200 |  |  |
Tax receivable for Washington State tax refund | $ |  |  | $ 0.5 |  |
Value added tax receivables | $ |  |  | $ 1.1 |  |
Percentage of voting equity interests acquired | 100.00% |  |  |  |
ISDC |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Number of employees | employee |  |  |  |  | 286
Initial cash consideration |  |  |  |  | £ 8,862
Total consideration transferred |  |  |  |  | £ 8,862
Percentage of voting equity interests acquired |  |  |  | 100.00% | 100.00%
Not later than one year | Velocity Partners |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Fair value of deferred consideration |  | 3,000 |  |  |
Later than one year and not later than two years | Velocity Partners |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Fair value of deferred consideration |  | £ 1,500 |  |  |

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