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Summary of significant accounting policies - Revenue recognition (Details) - adidas
£ in Millions
Aug. 01, 2015
GBP (£)
item
Information about adidas agreement  
Term of agreement (in years) 10 years
Minimum guarantee payable £ 750
Maximum increase in guarantee payable per year £ 4
Maximum possible percentage of reduction in guarantee per year 30.00%
Number of consecutive seasons of non-participation in Champions League that would impact guarantee payable by adidas | item 2