Leases - Balance sheet information (Details) - Hman Group holdings Inc and subsidiaries - USD ($) $ in Thousands |
Mar. 27, 2021 |
Dec. 26, 2020 |
Dec. 28, 2019 |
|---|---|---|---|
| Lessee, Lease, Description [Line Items] | |||
| Finance lease assets, net, included in property plant and equipment | $ 1,727 | $ 1,919 | $ 2,101 |
| Current portion of long-term debt | 833 | 872 | 749 |
| Long-term debt, less current portion | 1,005 | 1,172 | 1,526 |
| Present value of lease liabilities | $ 1,838 | $ 2,044 | $ 2,275 |