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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) $ in Millions	Mar. 27, 2022 USD ($) $ / shares shares	Mar. 27, 2022 £ / shares	Dec. 31, 2021 USD ($)	Mar. 28, 2021 £ / shares shares	Mar. 28, 2021 $ / shares shares
Statement of Financial Position [Abstract]
Accounts and other receivables, net of allowances | $	$ 0.8		$ 0.8
Ordinary shares
Common stock, par value (in GBP per share) | (per share)	$ 0.50	£ 0.50		£ 0.50	$ 0.50
Common stock, shares authorized (in shares)	40,000,000			40,000,000	40,000,000
Common stock, shares issued (in shares)	28,944,000			28,944,000	28,944,000
Common stock, shares outstanding (in shares)	28,944,000			28,944,000	28,944,000
Deferred shares
Common stock, par value (in GBP per share) | £ / shares		£ 0.0001		£ 0.0001
Common stock, shares authorized (in shares)	761,835,318,444			761,835,318,444	761,835,318,444
Common stock, shares issued (in shares)	761,835,318,444			761,835,318,444	761,835,318,444
Common stock, shares outstanding (in shares)	761,835,318,444			761,835,318,444	761,835,318,444

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Amount of allowance for credit loss on accounts receivable, classified as current.

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