| 開発事業総利益又は開発事業総損失(△) | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 開発事業総利益又は開発事業総損失(△)、売上総利益 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| 開発事業総利益 | ja | http://www.xbrl.org/2003/role/positiveLabel | http://www.xbrl.org/2003/role/link |
| 開発事業総損失(△) | ja | http://www.xbrl.org/2003/role/negativeLabel | http://www.xbrl.org/2003/role/link |
| Gross profit (loss) - development business | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Gross profit (loss) - development business - GP | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Gross profit - development business | en | http://www.xbrl.org/2003/role/positiveLabel | http://www.xbrl.org/2003/role/link |
| Gross loss - development business | en | http://www.xbrl.org/2003/role/negativeLabel | http://www.xbrl.org/2003/role/link |