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Goodwill - Goodwill Impairment Testing Assumptions (Details) - GBP (£)
£ in Thousands
12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Disclosure of detailed information about intangible assets [line items]      
Revenue growth rate   25.00% 25.00%
Discount rate applied to cash flow projections 12.80% 14.90% 13.50%
Terminal growth rate 2.00% 1.50% 1.50%
Revenue growth rate      
Disclosure of detailed information about intangible assets [line items]      
Value in use change £ (531,159)    
Operating cash flows rate      
Disclosure of detailed information about intangible assets [line items]      
Value in use change (213,166)    
Discount rate, measurement input      
Disclosure of detailed information about intangible assets [line items]      
Value in use change (208,200)    
Terminal growth rate      
Disclosure of detailed information about intangible assets [line items]      
Value in use change £ (58,310)    
Baseline assumptions      
Disclosure of detailed information about intangible assets [line items]      
Discount rate applied to cash flow projections 1280.00%    
Terminal growth rate 200.00%    
Sensitivity assumptions      
Disclosure of detailed information about intangible assets [line items]      
Discount rate applied to cash flow projections 13.80%    
Terminal growth rate 1.50%    
Minimum      
Disclosure of detailed information about intangible assets [line items]      
Revenue growth rate 13.40%    
Operating cash flows rate 12.20%    
Minimum | Baseline assumptions      
Disclosure of detailed information about intangible assets [line items]      
Revenue growth rate 13.40%    
Operating cash flows rate 12.20%    
Minimum | Sensitivity assumptions      
Disclosure of detailed information about intangible assets [line items]      
Revenue growth rate 7.00%    
Operating cash flows rate 10.00%    
Maximum      
Disclosure of detailed information about intangible assets [line items]      
Revenue growth rate 17.00%    
Operating cash flows rate 15.50%    
Maximum | Baseline assumptions      
Disclosure of detailed information about intangible assets [line items]      
Revenue growth rate 17.00%    
Operating cash flows rate 15.50%    
Maximum | Sensitivity assumptions      
Disclosure of detailed information about intangible assets [line items]      
Revenue growth rate 8.00%    
Operating cash flows rate 14.00%