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Income tax expense - Tax rates (Details)
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Income tax expense      
Applicable tax rate 27.74% 27.74% 27.52%
Germany      
Income tax expense      
Corporate tax rate 15.00%    
Solidarity surcharge on corporate tax rate 5.50%    
Trade tax rate 11.92%    
Primary deferred tax rate 27.74% 27.45%  
Minimum | Non German      
Income tax expense      
Applicable tax rate 8.25% 2.50%  
Maximum | Non German      
Income tax expense      
Applicable tax rate 31.00% 29.40%