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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
	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

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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

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