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Revenue from contracts with customers - Significant estimates and judgments (Details) - adidas - GBP (£)
£ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2025
Jul. 31, 2023
Jun. 30, 2025
Aug. 01, 2015
Estimates and judgments        
Term of extension of agreement (in years)   10 years    
Minimum guarantee payable   £ 1,650.0   £ 750.0
Additional minimum guarantee payable   900.0    
Maximum increase in guarantee payable per year   4.4    
Amount of deduction for each year of non-participation in UEFA Champions League   £ 10.0    
Amount of deduction for non-participation in UEFA Champions League     £ 10.0  
Impact of changing estimated deduction by one year on revenue recognized in any one financial year £ 0.8