| WTZi-Benachrichtigungen Anlagevermögen, Zwischensumme [Mitglied] | de | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Noncurrent-assets WTZi notifications subtotal [member] | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Messages WTZi immobilisations corporelles, sous-total [membre] | fr | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| WTZi-meldingen vaste activa, subtotaal [member] | nl | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |