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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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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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