| 差入保証金 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 差入保証金、投資その他の資産 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| 長期差入保証金 | ja | http://disclosure.edinet-fsa.go.jp/jppfs/sec/role/label | http://www.xbrl.org/2003/role/link |
| Guarantee deposits | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Guarantee deposits-IOA | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Long-term guarantee deposits | en | http://disclosure.edinet-fsa.go.jp/jppfs/sec/role/label | http://www.xbrl.org/2003/role/link |