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Explanation of the Effects of Transition to International Financial Reporting Standards - Summary of Impact of IFRS Adjustments for Unrecognised Deferred Tax Assets (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of comparative information prepared under previous GAAP [line items]      
Total unrecognised deferred tax assets € 113,062 € 111,459 € 109,167
IAS 19 adjustment - employees' leaving entitlement [member]      
Disclosure of comparative information prepared under previous GAAP [line items]      
Total unrecognised deferred tax assets € 470 357 392
Effect of transition to IFRSs [member]      
Disclosure of comparative information prepared under previous GAAP [line items]      
Total unrecognised deferred tax assets   1,865 2,410
Effect of transition to IFRSs [member] | Revenue of finished goods derecognized [member]      
Disclosure of comparative information prepared under previous GAAP [line items]      
Total unrecognised deferred tax assets   881 1,258
Effect of transition to IFRSs [member] | Government Grants [member]      
Disclosure of comparative information prepared under previous GAAP [line items]      
Total unrecognised deferred tax assets   403 476
Effect of transition to IFRSs [member] | IAS 19 adjustment - employees' leaving entitlement [member]      
Disclosure of comparative information prepared under previous GAAP [line items]      
Total unrecognised deferred tax assets   357 392
Effect of transition to IFRSs [member] | Costs not eligible for capitalization included in property, plant and equipment [member]      
Disclosure of comparative information prepared under previous GAAP [line items]      
Total unrecognised deferred tax assets   95 115
Effect of transition to IFRSs [member] | Costs not eligible for capitalization included in intangible assets [member]      
Disclosure of comparative information prepared under previous GAAP [line items]      
Total unrecognised deferred tax assets     88
Effect of transition to IFRSs [member] | Deferred revenues and costs for Service Type Warranty [member]      
Disclosure of comparative information prepared under previous GAAP [line items]      
Total unrecognised deferred tax assets   € 129 € 81