Restructuring - Canadian Restructuring Plan Charges Incurred (Details) - Canadian Restructuring Plan - Hman Group holdings Inc and subsidiaries - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 27, 2021	Mar. 28, 2020	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Restructuring Cost and Reserve [Line Items]
Total	$ 35	$ 1,732
Facility consolidation
Restructuring Cost and Reserve [Line Items]
Labor expense (income)		279	$ 682	$ 1,751	$ 503
Inventory valuation adjustments			596	3,799	8,694
Consulting and legal fees		48	192	225	314
Other expense	5	717	1,118	2,126	116
Rent and related charges		639	1,535	584
Severance	$ 30	$ 49	$ 707	617
Exit of certain lines of business
Restructuring Cost and Reserve [Line Items]
Inventory valuation adjustments				535	1,152
Other expense				488
Gain on disposal of assets				$ (458)	837
Severance					$ 2,749

Amount of expenses for consulting and legal fees incurred by the company.

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Amount of rent and related expenses incurred by the company.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit.

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Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.

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Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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