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v3.19.3

Commitments and Contingencies (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 29, 2019 USD ($) | Sep. 29, 2019 USD ($) | Sep. 29, 2019 GBP (£) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 GBP (£) | Sep. 29, 2019 GBP (£) | Dec. 31, 2018 GBP (£)
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Amount drawn/utilized | $ 3,500,000 |  |  |  |  |  |
Insurance deductible |  | $ 1,000,000 |  |  |  |  |
Committed Banking Facilities |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Debt maximum borrowing capacity | 150,000,000.0 | 150,000,000.0 |  | $ 150,000,000.0 |  |  |
Amount drawn/utilized |  | 0 |  |  |  |  |
Other - Bank overdraft |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Amount drawn/utilized |  |  |  | 3,500,000 |  |  |
Bonding Facility For Bank Guarantees |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Debt maximum borrowing capacity | 3,800,000.0 | 3,800,000.0 |  | 3,800,000.0 |  | £ 3,000,000.0 | £ 3,000,000.0
Amount drawn/utilized |  | 1,400,000 | £ 1,000,000 | 1,400,000 | £ 1,000,000 |  |
Letter of Credit |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Debt maximum borrowing capacity | 8,900,000.0 | 8,900,000.0 |  | 8,900,000.0 |  | £ 7,000,000.0 | £ 7,000,000.0
Amount drawn/utilized |  | 0 |  | $ 0 |  |  |
Maximum |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
potential exposure | $ 1,000,000 | $ 1,000,000 |  |  |  |  |

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