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Income Tax Expense - Summary of Unrecognised Deferred Tax Assets (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount € 427,829 € 415,012
Unrecognised deferred tax assets, Tax effect 104,973 102,135
Tax loss carry forwards [member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 378,307 367,620
Unrecognised deferred tax assets, Tax effect 93,266 90,025
Provision for contingent liabilities [member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 4,892 6,588
Unrecognised deferred tax assets, Tax effect 1,396 1,893
Inventory obsolescence [member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 10,989 7,803
Unrecognised deferred tax assets, Tax effect 2,272 2,197
Allowance for doubtful accounts [member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 3,218 3,744
Unrecognised deferred tax assets, Tax effect 772 899
Intercompany profit on inventory [member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 7,644 7,890
Unrecognised deferred tax assets, Tax effect 2,203 2,274
Provision for warranties [member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 1,929 2,613
Unrecognised deferred tax assets, Tax effect 556 753
Impairment of non-financial assets [Member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 3,051 2,613
Unrecognised deferred tax assets, Tax effect 587 591
Other temporary differences [member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 17,799 16,141
Unrecognised deferred tax assets, Tax effect € 3,921 € 3,503