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Commitments and Contingencies - Additional Information (Details)	1 Months Ended		3 Months Ended		12 Months Ended
	Nov. 30, 2020 lawsuits	Feb. 28, 2014 people	Mar. 28, 2021 USD ($) facility	Mar. 28, 2021 GBP (£) facility	Dec. 31, 2020 USD ($) facility	Dec. 31, 2020 GBP (£) facility	Mar. 28, 2021 GBP (£)	Dec. 31, 2020 GBP (£)
Loss Contingencies [Line Items]
Long-term debt, gross			$ 73,600,000
Number of bonding facilities for bank guarantees | facility			2	2
Amount drawn/utilized			$ 19,500,000
Borrowing capacity			4,000,000.0
Credit facility, amount drawn			0		$ 0
Individuals with minor injuries | people		3
Number of lawsuits | lawsuits	3
Committed Banking Facilities
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			150,000,000.0		150,000,000.0
Revolving credit facility
Loss Contingencies [Line Items]
Long-term debt, gross			23,600,000		4,100,000
Borrowing capacity			126,400,000		145,900,000
Letter of Credit
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			1,400,000		$ 1,300,000		£ 1,000,000.0	£ 1,000,000.0
United Kingdom, Pounds
Loss Contingencies [Line Items]
Number of bonding facilities for bank guarantees | facility					1	1
United Kingdom, Pounds | Bonding Facility For Bank Guarantees
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			6,200,000		$ 6,100,000		£ 4,500,000
Amount drawn/utilized			$ 1,400,000	£ 1,000,000.0	1,400,000	£ 1,000,000.0
United States of America, Dollars
Loss Contingencies [Line Items]
Number of bonding facilities for bank guarantees | facility			1	1
United States of America, Dollars | Bonding Facility For Bank Guarantees
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			$ 1,500,000		1,500,000
Amount drawn/utilized			$ 800,000		$ 800,000

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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