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Property And Equipment (Narrative) (Details) - Aug. 31, 2019 £ in Millions, $ in Millions | GBP (£) | USD ($)
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Property And Equipment [Abstract] |  |
Capital costs | £ 9.0 | $ 10.9

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition Capital Costs + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | instant