| 利益剰余金 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 利益剰余金 [メンバー] | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| 利益剰余金合計 | ja | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| Retained earnings | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Retained earnings [member] | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Total retained earnings | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |