XML 287 R280.htm IDEA: XBRL DOCUMENT v3.20.1
Shareholders' equity - Dividends - Dividends per share (Details) - € / shares
Jul. 24, 2019
May 21, 2019
Jul. 25, 2018
May 04, 2018
Jul. 26, 2017
Jun. 01, 2017
Jul. 25, 2016
Jun. 07, 2016
Shareholders' equity [abstract]                
Interim dividend per share, current year (in euros per share) € 0.30   € 0.30   € 0.25   € 0.20  
Dividend per share, balance for prior year (in euros per share)   € 0.40   € 0.40   € 0.40   € 0.40