| 開発事業等総利益又は開発事業等総損失(△) | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 開発事業等総利益又は開発事業等総損失(△)、建設業 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| 開発事業等総利益 | ja | http://www.xbrl.org/2003/role/positiveLabel | http://www.xbrl.org/2003/role/link |
| 開発事業等総損失(△) | ja | http://www.xbrl.org/2003/role/negativeLabel | http://www.xbrl.org/2003/role/link |
| Gross profit (loss) on development business and other | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Gross profit (loss) on development business and other-CNS | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Gross profit on development business and other | en | http://www.xbrl.org/2003/role/positiveLabel | http://www.xbrl.org/2003/role/link |
| Gross loss on development business and other | en | http://www.xbrl.org/2003/role/negativeLabel | http://www.xbrl.org/2003/role/link |