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Income Tax Expense - Summary of Unrecognised Deferred Tax Assets (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount € 424,128 € 458,050
Unrecognised deferred tax assets, Tax effect 100,735 110,729
Tax loss carry forwards [member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 368,779 396,763
Unrecognised deferred tax assets, Tax effect 88,328 97,107
Provision for contingent liabilities [member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 12,231 14,311
Unrecognised deferred tax assets, Tax effect 2,888 3,695
Inventory obsolescence [member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 11,985 9,952
Unrecognised deferred tax assets, Tax effect 2,560 2,480
Allowance for doubtful accounts [member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 6,810 11,006
Unrecognised deferred tax assets, Tax effect 1,540 2,547
Intercompany profit on inventory [member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 5,676 5,958
Unrecognised deferred tax assets, Tax effect 1,614 439
Provision for warranties [member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 3,117 3,646
Unrecognised deferred tax assets, Tax effect 898 1,051
Impairment of non-financial assets [Member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 3,989 3,318
Unrecognised deferred tax assets, Tax effect 1,018 967
Goodwill and intangible assets [member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 692 680
Unrecognised deferred tax assets, Tax effect 48 196
IAS 19 adjustment—employees' leaving entitlement [member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 1,807 1,806
Unrecognised deferred tax assets, Tax effect 434 433
Deferred Costs [Member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 45 2,866
Unrecognised deferred tax assets, Tax effect 9 822
Other temporary differences [member]    
Deferred Tax Assets And Liabilities [line items]    
Unrecognised deferred tax assets, Gross Amount 8,997 7,744
Unrecognised deferred tax assets, Tax effect € 1,398 € 992