| Reserve of remeasurements of defined benefit plans [member] | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| This member stands for a component of equity resulting from remeasurements of defined benefit plans. [Refer: Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Cúlchiste atomhas ar phleananna sochair shainithe [member] | ga | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Seasann an ball seo do chomhpháirt de chothromas a eascraíonn as atomhais phleananna sochair shainithe. [Féach: Ioncam cuimsitheach eile, glan ó cháin, gnóthachain (caillteanais) ar atomhais ar phleananna sochair shainithe] | ga | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |