| 未収入金 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 未収入金 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| 未収入金 | ja | http://disclosure.edinet-fsa.go.jp/jppfs/ivt/role/label | http://www.xbrl.org/2003/role/link |
| 未収入金 | ja | http://disclosure.edinet-fsa.go.jp/jppfs/fnd/role/label | http://www.xbrl.org/2003/role/link |
| Accounts receivable - other | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Accounts receivable-other | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Accounts receivable | en | http://disclosure.edinet-fsa.go.jp/jppfs/ivt/role/label | http://www.xbrl.org/2003/role/link |
| Accounts receivable | en | http://disclosure.edinet-fsa.go.jp/jppfs/fnd/role/label | http://www.xbrl.org/2003/role/link |