| Number of shares outstanding | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Number of shares outstanding at beginning of period | en | http://www.xbrl.org/2003/role/periodStartLabel | http://www.xbrl.org/2003/role/link |
| Number of shares outstanding at end of period | en | http://www.xbrl.org/2003/role/periodEndLabel | http://www.xbrl.org/2003/role/link |
| The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |