| Machinery, equipment and vehicles, net | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Machinery, equipment and vehicles, net | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Machinery and vehicles, net | en | http://disclosure.edinet-fsa.go.jp/jppfs/cns/role/label | http://www.xbrl.org/2003/role/link |
| 機械装置及び運搬具(純額) | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 機械装置及び運搬具(純額) | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| 機械・運搬具(純額) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/cns/role/label | http://www.xbrl.org/2003/role/link |