v3.25.3
Income Tax - Reconciliation of Effective Tax Rate (Details) - EUR (€)
€ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Disclosure of income tax [abstract]      
Net profit before tax € 469,980 € 293,782 € 153,652
Expected income tax expense at a 25% statutory UK tax rate (117,495) (73,446) (38,413)
Increased/ decreased by:      
Non-deductible expenses for tax purposes (2,936) (2,175) (2,699)
Non-deductible share-based compensation (18) (1,098) (19,880)
Change in permanent items     687
Minimum Taxation   (1,915)  
Income exempted from tax   1,247  
Previous year current taxes 1,689 (354) (454)
Previous year deferred taxes 1,318 (5,042) (5,007)
Changes in non-recognition of deferred tax assets on temporary differences/tax loss carry forwards 1,504 (11,369) (8,400)
Tax rate differences (18,202) (13,410) (5,628)
Tax rate changes 12,288 2,461 (142)
Other 199 2,921 1,306
Income tax expense € (121,653) € (102,180) € (78,630)