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Derivative Financial Instruments - Summary of Information Regarding the Contract Amount in Estimated Fair Value of All of the Group's Forward Exchange Contacts (Detail) - EUR (€) € in Thousands |  | 12 Months Ended
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Jan. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Derivative Financial Instruments [line items] |  |  |
Contract amount | € 67,540 | € 43,645 | € 49,627
Unrealised gains (losses) | (1,070) | (102) | 72
Financial liabilities at fair value, class [member] |  |  |
Disclosure Of Derivative Financial Instruments [line items] |  |  |
Contract amount | 41,842 | 16,186 | 18,538
Unrealised gains (losses) | (1,293) | (320) | (267)
Financial assets at fair value, class [member] |  |  |
Disclosure Of Derivative Financial Instruments [line items] |  |  |
Contract amount | 25,698 | 27,459 | 31,089
Unrealised gains (losses) | € 223 | € 218 | € 339

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- Definition The gains (losses) recognised in other comprehensive income on change in value of forward elements of forward contracts, net of tax. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_91_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The gains (losses) recognised in profit or loss for assets measured at fair value that are attributable to the change in unrealised gains or losses relating to those assets held at the end of the reporting period. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_f&doctype=Standard -URIDate 2018-03-16 + Details
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