| Balance at 27 November 2016 | | 12.6 | 256.9 | (48.0) | (116.2) | 0.2 | 156.9 | 262.4 |
| IFRS 15: Impact of change in accounting policy | | — | — | — | — | — | (13.8) | (13.8) |
| Restated balance at 27 November 2016* | | 12.6 | 256.9 | (48.0) | (116.2) | 0.2 | 143.1 | 248.6 |
| Restated loss for the period* | | — | — | — | — | — | (8.3) | (8.3) |
| Other comprehensive income: | | | | | | | | |
| Cash flow hedges | | | | | | | | |
| – Gains arising on hedging contracts | 4.9 | — | — | — | — | 0.5 | — | 0.5 |
| – Losses arising on hedging contracts | 4.9 | — | — | — | — | (0.2) | — | (0.2) |
| Translation of foreign subsidiary | 4.9 | — | — | — | — | 0.2 | — | 0.2 |
| Restated Total Comprehensive Income/(Expense) for the Period Ended 3 December 2017* | | — | — | — | — | 0.5 | (8.3) | (7.8) |
| Transactions with owners: | | | | | | | | |
| – Issues of ordinary shares | 4.9 | — | 0.9 | — | — | — | — | 0.9 |
| – Allotted in respect of share option schemes | 4.9 | — | 0.6 | — | — | — | — | 0.6 |
| – Share-based payments charge | 4.10 | — | — | — | — | — | 5.3 | 5.3 |
| Total Transactions with Owners | | — | 1.5 | — | — | — | 5.3 | 6.8 |
| Restated Balance at 3 December 2017* | | 12.6 | 258.4 | (48.0) | (116.2) | 0.7 | 140.1 | 247.6 |
| Loss for the period | | — | — | — | — | — | (44.9) | (44.9) |
| Other comprehensive income: | | | | | | | | |
| Cash flow hedges | | | | | | | | |
| – Gains arising on hedging contracts | 4.9 | — | — | — | — | 1.0 | — | 1.0 |
| – Losses arising on hedging contracts | 4.9 | — | — | — | — | — | — | — |
| Translation of foreign subsidiary | 4.9 | — | — | — | — | (0.3) | — | (0.3) |
| Total Comprehensive Income/(Expense) for the Period Ended 2 December 2018 | | — | — | — | — | 0.7 | (44.9) | (44.2) |
| Transactions with owners: | | | | | | | | |
| – Issues of ordinary shares | 4.9 | 1.3 | 322.1 | — | — | — | — | 323.4 |
| – Allotted in respect of share option schemes | 4.9 | 0.1 | 6.2 | — | — | — | — | 6.3 |
| – Disposal of treasury shares | 4.9 | — | — | 11.7 | — | — | 3.5 | 15.2 |
| – Transfer of treasury shares to participants | 4.9 | — | — | 27.8 | — | — | (27.8) | — |
| – Reclassification between reserves | 4.9 | — | 0.3 | (0.7) | — | — | 0.4 | — |
| – Share-based payments charge | 4.10 | — | — | — | — | — | 6.1 | 6.1 |
| – Disposal of Ocado Information Technology Ltd | | — | — | — | — | — | 2.2 | 2.2 |
| Total Transactions with Owners | | 1.4 | 328.6 | 38.8 | — | — | (15.6) | 353.2 |
| Balance at 2 December 2018 | | 14.0 | 587.0 | (9.2) | (116.2) | 1.4 | 79.6 | 556.6 |