| 出資剰余金 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 出資剰余金、投資業 [メンバー] | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| 出資剰余金(純額) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/inv/role/label | http://www.xbrl.org/2003/role/link |
| Capital surplus | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Capital surplus-INV [member] | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Capital surplus, net | en | http://disclosure.edinet-fsa.go.jp/jppfs/inv/role/label | http://www.xbrl.org/2003/role/link |