| 繰延資産 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 繰延資産 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| 繰延資産合計 | ja | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| 繰延資産計 | ja | http://disclosure.edinet-fsa.go.jp/jppfs/ivt/role/totalLabel | http://www.xbrl.org/2003/role/link |
| 繰延資産計 | ja | http://disclosure.edinet-fsa.go.jp/jppfs/sec/role/totalLabel | http://www.xbrl.org/2003/role/link |
| Deferred assets | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Deferred assets | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Total deferred assets | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| Total deferred assets | en | http://disclosure.edinet-fsa.go.jp/jppfs/ivt/role/totalLabel | http://www.xbrl.org/2003/role/link |
| Total deferred assets | en | http://disclosure.edinet-fsa.go.jp/jppfs/sec/role/totalLabel | http://www.xbrl.org/2003/role/link |