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Income Tax Expense - Summary of Unrecognised Deferred Tax Assets (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets € 110,729 € 114,057
Tax loss carry forwards [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 97,107 97,544
Provision for contingent liabilities [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 3,695 5,839
Inventory obsolescence [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 2,480 2,336
Allowance for doubtful accounts [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 2,547 2,296
Intercompany profit on inventory [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 439 1,643
Provision for warranties [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 1,051 1,419
Impairment of non-financial assets [Member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 967 984
Goodwill and intangible assets [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 196 483
IAS 19 adjustment—employees' leaving entitlement [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 433 389
Deferred Costs [Member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 822  
Other temporary differences [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets € 992 € 1,124