| Deferred income including contract liabilities recognised as of acquisition date | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Total deferred income including contract liabilities recognised as of acquisition date | en | http://www.xbrl.org/2009/role/negatedTotalLabel | http://www.xbrl.org/2003/role/link |
| The amount recognised as of the acquisition date for deferred income including contract liabilities assumed in a business combination. [Refer: Deferred income including contract liabilities; Business combinations [member]] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Ricavi differiti comprese le passività derivanti da contratti rilevati alla data di acquisizione | it | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| L'ammontare rilevato alla data di acquisizione per i ricavi differiti comprese le passività derivanti da contratti assunte in un'aggregazione aziendale. [Rif: Ricavi differiti comprese le passività derivanti da contratti; Aggregazioni aziendali [member]] | it | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Totale ricavi differiti comprese le passività derivanti da contratti rilevati alla data di acquisizione | it | http://www.xbrl.org/2009/role/negatedTotalLabel | http://www.xbrl.org/2003/role/link |