| 単一セグメントである旨 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 単一セグメントである旨、報告セグメントごとの負ののれん発生益に関する情報 | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Description of fact that company's business comprises single segment | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Description of fact that company's business comprises single segment, Information about gain on bargain purchase goodwill for each reportable segment | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |