| Increase (decrease) in net assets available for benefits | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Total increase (decrease) in net assets available for benefits | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| The increase (decrease) in net assets available for benefits. Net assets available for benefits are assets of a retirement benefit plan less liabilities other than the actuarial present value of promised retirement benefits. | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Méadú (laghdú) ar ghlansócmhainní atá ar fáil le haghaidh sochar | ga | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| An méadú (laghdú) ar ghlansócmhainní atá ar fáil le haghaidh sochar. Is éard atá sna glansócmhainní atá ar fáil le haghaidh sochar, sócmhainní plean sochair scoir lúide dliteanais seachas an luach láithreach achtúireach ar shochair scoir arna ngealladh. | ga | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Méadú iomlán (laghdú) ar ghlansócmhainní atá ar fáil le haghaidh sochar | ga | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |