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Revenue from contracts with customers - Significant estimates and judgments (Details)
£ in Millions
12 Months Ended
Aug. 01, 2015
GBP (£)
item
Jun. 30, 2021
person
item
Estimates and judgments    
Number of supporters for final home match | person   10,000
adidas    
Estimates and judgments    
Term of agreement (in years) 10 years  
Minimum guarantee payable £ 750  
Number of consecutive seasons of non-participation in Champions League that would impact guarantee payable by adidas | item 2 2
Maximum increase in guarantee payable per year £ 4  
Maximum possible percentage of reduction in guarantee per year 30.00%