| 未成工事支出金等の増減額(△は増加) | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 未成工事支出金等の増減額(△は増加)、営業活動によるキャッシュ・フロー、建設業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Decrease (increase) in costs on construction contracts in progress | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Decrease (increase) in costs on construction contracts in progress - 2 - OpeCF - CNS | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |