| The amount of depreciation and amortisation expense. Depreciation and amortisation are the systematic allocations of depreciable amounts of assets over their useful lives. | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Depreciation and amortisation expense | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Depreciation and amortisation expense | en | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |
| Total depreciation and amortisation expense | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |