| Quarterly consolidated statement of cash flows | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Quarterly consolidated statement of cash flows [heading] | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Condensed quarterly consolidated statement of cash flows | en | http://disclosure.edinet-fsa.go.jp/jpcrp/std/alt/role/label | http://www.xbrl.org/2003/role/link |
| 四半期連結キャッシュ・フロー計算書 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 四半期連結キャッシュ・フロー計算書 [目次項目] | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| 要約四半期連結キャッシュ・フロー計算書 | ja | http://disclosure.edinet-fsa.go.jp/jpcrp/std/alt/role/label | http://www.xbrl.org/2003/role/link |