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Share-based compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jul. 31, 2024
Sep. 21, 2023
Jul. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Share based payment, cost not yet recognized $ 56    
Share based payment, cost not yet recognized, period for recognition (in years) 1 year 10 months 24 days    
2023 Omnibus Equity Incentive Plan      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Number of shares authorized (in shares)   6,750,000  
Ferguson Group Employee Share Purchase Plan 2021      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Shares available for grant (in shares) 20,000,000    
RSU awards granted      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Share based compensation, award vesting period (in years) 3 years    
PSU awards granted      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Share based compensation, award vesting period (in years) 3 years    
PSU-ED, equity-settled awards granted      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Share based compensation, award vesting period (in years) 3 years    
Employee Stock      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Liability in connection with grants $ 8   $ 13
Employee Stock | Ferguson Group Employee Share Purchase Plan 2021      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Shares available for grant (in shares) 19,500,000    
Share based compensation, purchase price of common stock (in percent) 85.00%    
Share based compensation, shares purchased (in shares) 160,800    
Share based compensation, per share weighted average price of shares purchased (in usd per share) $ 106.02