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Share-Based Payments - Disclosure of Details of Breakdown of the Closing Balance SO (Detail) | Dec. 31, 2017 EUR (€) | Dec. 31, 2016 EUR (€) | Dec. 31, 2015 EUR (€)
--- | --- | --- | ---
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 181,008 | 147,359 | 143,694
Exercisable | 181,008 | 147,359 | 53,859
Share Option [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 2,133,100 | 1,160,000 | 861,000
Exercisable | 755,650 | 85,000 |
Share Option [Member] | Exercise Price of Euro 7.57 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 471,000 | 471,000 | 471,000
Exercisable | 471,000 |  |
Exercise price, outstanding | € 7.57 | € 7.57 | € 7.57
Exercise price, Exercisable | € 7.57 |  |
Share Option [Member] | Exercise Price of Euro 19.01 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 40,000 | 40,000 | 75,000
Exercisable | 40,000 | 40,000 |
Exercise price, outstanding | € 19.01 | € 19.01 | € 19.01
Exercise price, Exercisable | € 19.01 | € 19.01 |
Share Option [Member] | Exercise Price of Euro 48.90 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 120,000 | 120,000 | 120,000
Exercisable | 75,000 | 45,000 |
Exercise price, outstanding | € 48.90 | € 48.90 | € 48.90
Exercise price, Exercisable | € 48.90 | € 48.90 |
Share Option [Member] | Exercise Price of Euro 66.06 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 170,000 | 170,000 | 195,000
Exercisable | 85,000 |  |
Exercise price, outstanding | € 66.06 | € 66.06 | € 66.06
Exercise price, Exercisable | € 66.06 |  |
Share Option [Member] | Exercise Price of Euro 65.68 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 75,000 | 75,000 |
Exercisable | 18,750 |  |
Exercise price, outstanding | € 65.68 | € 65.68 |
Exercise price, Exercisable | € 65.68 |  |
Share Option [Member] | Exercise Price of Euro 62.82 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 33,000 | 33,000 |
Exercisable | 8,250 |  |
Exercise price, outstanding | € 62.82 | € 62.82 |
Exercise price, Exercisable | € 62.82 |  |
Share Option [Member] | Exercise Price of Euro 59.04 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 22,000 | 22,000 |
Exercisable | 5,500 |  |
Exercise price, outstanding | € 59.04 | € 59.04 |
Exercise price, Exercisable | € 59.04 |  |
Share Option [Member] | Exercise Price of Euro 53.96 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 101,300 | 110,000 |
Exercisable | 24,425 |  |
Exercise price, outstanding | € 53.96 | € 53.96 |
Exercise price, Exercisable | € 53.96 |  |
Share Option [Member] | Exercise Price of Euro 62.24 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 10,000 | 10,000 |
Exercisable | 2,500 |  |
Exercise price, outstanding | € 62.24 | € 62.24 |
Exercise price, Exercisable | € 62.24 |  |
Share Option [Member] | Exercise Price of Euro 62.80 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 9,300 | 9,300 |
Exercisable | 2,325 |  |
Exercise price, outstanding | € 62.80 | € 62.80 |
Exercise price, Exercisable | € 62.80 |  |
Share Option [Member] | Exercise Price of Euro 64.39 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 9,300 | 16,500 |
Exercisable | 2,325 |  |
Exercise price, outstanding | € 64.39 | € 64.39 |
Exercise price, Exercisable | € 64.39 |  |
Share Option [Member] | Exercise Price of Euro 68.33 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 8,300 | 8,300 |
Exercisable | 2,075 |  |
Exercise price, outstanding | € 68.33 | € 68.33 |
Exercise price, Exercisable | € 68.33 |  |
Share Option [Member] | Exercise Price of Euro 69.75 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 72,900 | 74,960 |
Exercisable | 18,225 |  |
Exercise price, outstanding | € 69.75 | € 69.75 |
Exercise price, Exercisable | € 69.75 |  |
Share Option [Member] | Exercise price of Euro 66.35 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 1,100 |  |
Exercisable | 275 |  |
Exercise price, outstanding | € 66.35 |  |
Exercise price, Exercisable | € 66.35 |  |
Share Option [Member] | Exercise price of Euro 66.11 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 19,100 |  |
Exercise price, outstanding | € 66.11 |  |
Share Option [Member] | Exercise price of Euro 66.25 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 7,200 |  |
Exercise price, outstanding | € 66.25 |  |
Share Option [Member] | Exercise price of Euro 60.77 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 16,500 |  |
Exercise price, outstanding | € 60.77 |  |
Share Option [Member] | Exercise price of Euro 59.05 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 118,500 |  |
Exercise price, outstanding | € 59.05 |  |
Share Option [Member] | Exercise price of Euro 60.54 [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 111,600 |  |
Exercise price, outstanding | € 60.54 |  |
Share Option [Member] | Exercise price of Euro 71.61 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 30,900 |  |
Exercise price, outstanding | € 71.61 |  |
Share Option [Member] | Exercise price of Euro 74.22 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 52,600 |  |
Exercise price, outstanding | € 74.22 |  |
Share Option [Member] | Exercise price of Euro 39.00 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 625,200 |  |
Exercise price, outstanding | € 39.00 |  |
Share Option [Member] | Exercise price of Euro 38.18 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding | 8,300 |  |
Exercise price, outstanding | € 38.18 |  |

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