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Income Tax Expense - Summary of Unrecognised Deferred Tax Assets (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets € 114,057 € 113,062
Tax loss carry forwards [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 97,544 99,133
Provision for contingent liabilities [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 5,839 3,234
Inventory obsolescence [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 2,336 2,055
Allowance for doubtful accounts [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 2,296 2,145
Intercompany profit on inventory [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 1,643 1,040
Provision for warranties [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 1,419 1,343
Impairment of property, plant and equipment [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 984 1,228
Goodwill and intangible assets [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 483 569
IAS 19 adjustment—employees' leaving entitlement [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets 389 470
Deferred Costs [Member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets   541
Other temporary differences [member]    
Deferred Tax Assets And Liabilities [line items]    
Total unrecognised deferred tax assets € 1,124 € 1,304