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General principles for the preparation of the consolidated financial statements - Additional Information (Detail) - EUR (€) € in Thousands |  |  | 4 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 02, 2020 | Feb. 28, 2020 | Apr. 30, 2021 | Apr. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2017 | Apr. 29, 2020 | Jan. 01, 2017
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Profit loss |  |  |  |  | € (33,680) | € 33,119 |  | € (30,845) | [1] |  |
Operating profit |  |  |  |  | (22,488) | (25,458) |  | (23,955) | [1] |  |
Equity |  |  |  |  | 104,818 | 138,181 | € 104,534 | 104,534 |  |  | € 143,999
Changes in working capital |  |  |  |  | € 4,905 | 38,757 |  |  |  |  |
Percentage of revenue from group |  |  |  |  | 10.00% |  |  |  |  |  |
Revenue |  |  |  |  | € 386,962 | 428,539 |  | 448,880 | [1] |  |
Cash receipts from government grants |  |  |  |  | 1,626 | 1,061 | € 1,068 | € 1,068 |  |  |
Advance payment for rights issue |  | € 15,000 |  |  |  |  |  |  |  |  |
Proceeds from rights issue | € 2,500 |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 39,799 | 62,131 |  |  |  |  |
Long-term borrowings |  |  |  |  | 14,091 | 10,361 |  |  |  |  |
Current portion of long-term borrowings |  |  |  |  | 4,321 | 10,582 |  |  |  |  |
Bank overdrafts and short-term borrowings |  |  |  |  | 24,170 | € 35,148 |  |  |  |  |
Unused credit facility |  |  |  |  | 24,251 |  |  |  |  |  |
State agency guarantee percent |  |  |  |  |  |  |  |  |  | 90.00% |
Trade receivables export [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unused credit facility |  |  |  |  | 18,080 |  |  |  |  |  |
Trade receivables secured borrowings [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unused credit facility |  |  |  |  | 3,577 |  |  |  |  |  |
Bank overdrafts [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unused credit facility |  |  |  |  | 2,594 |  |  |  |  |  |
COVID19 [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase Decrease in Percentage of Entitys Revenue |  |  | 20.00% | 20.00% |  |  |  |  |  |  |
Increase Decrease in Percentage of Fixed Cost |  |  | 5.00% | 10.00% |  |  |  |  |  |  |
Income from Long Term Finance |  |  |  | € 65,000 |  |  |  |  |  |  |
Income From Shareholders |  |  |  | € 15,000 |  |  |  |  |  |  |
Loans to corporate entities [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash receipts from government grants |  |  |  |  | 7,144 |  |  |  |  |  |
Subsidized loans |  |  |  |  | 9,755 |  |  |  |  |  |
Gross carrying amount [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying value of land and building |  |  |  |  | € 26,745 |  |  |  |  |  |
[1] | The Group has initially applied IFRS 9 as at January 1, 2018. Under the transition method chosen, comparative information has not been restated except for separately presenting impairment losses on trade receivables. See note 5(c).

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