| Defined benefit obligation, at present value | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Defined benefit obligation, at present value | en | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |
| The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Oibleagáid sochair shainithe, ag luach reatha | ga | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| An luach reatha, gan aon sócmhainn phlean a asbhaint, d’íocaíochtaí ionchasacha todhchaí a cheanglófar chun an oibleagáid a shocrú, oibleagáid a leanann as seirbhís fostaithe sa tréimhse reatha agus i dtréimhsí roimhe. [Féach: Sócmhainní plean, ag luach cóir] | ga | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Oibleagáid sochair shainithe, ag luach reatha | ga | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |