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Short-term and long-term debt - Additional Information (Details) - USD ($) $ in Thousands				3 Months Ended
	Mar. 02, 2022	Apr. 23, 2020	Dec. 19, 2019	Mar. 31, 2022	Mar. 03, 2022
Line of Credit Facility, Maximum Borrowing Capacity	$ 90,000
Debt Instrument, Basis Spread on Variable Rate	2.00%
Paycheck Protection Program [Member] \| CARES Act Loan [Member]
Debt Instrument, Interest Rate, Stated Percentage		1.00%
Unsecured loan		$ 2,475
Term of unforgiven loan		2 years
Deferral term of unforgiven loan		9 months
Forgiveness of loan				$ 2,475
Federal Funds Purchased [Member]
Debt Instrument, Basis Spread on Variable Rate	0.50%
SOFR
Debt Instrument, Basis Spread on Variable Rate	1.00%
Applicable leverage ratio
Additional interest percentage	7.00%
Revolving credit facility Amendment
Debt Instrument, Basis Spread on Variable Rate	1.00%
Additional interest percentage	0.50%
Revolving credit facility Amendment \| SOFR
Additional interest percentage	1.00%
Revolving credit facility Amendment \| SOFR \| FILO Tranche
Debt Instrument, Basis Spread on Variable Rate	1.00%
Additional interest percentage	0.50%
Revolving credit facility Amendment \| SOFR \| SOFR FILO Tranche
Additional interest percentage	7.50%
Revolving credit facility Amendment \| Prime commercial lending rate of Wells Fargo
Additional interest percentage	1.75%
Revolving credit facility Amendment \| Prime commercial lending rate of Wells Fargo \| FILO Tranche
Additional interest percentage	6.50%
Prior Term Loan Facility
Debt Instrument, Face Amount	$ 85,000
Payment of term loan deferred financing costs	4,300
Prepayment premium percentage year one				3.00%
Prepayment premium percentage year two				2.00%
Prepayment premium percentage year three				1.00%
Prepayment premium percentage year four and thereafter				0.00%
Principal payments on term loan, percentage				50.00%
Principal balance of debt	63,900
Payment of debt, cash flow amount	16,000
Lender fees and expenses on debt	3,300
Deferred financing costs	1,300
Credit facility, interest expense				$ 4,700
First Amendment
Line of Credit Facility, Maximum Borrowing Capacity		$ 2,500
Fourth Amendment
Minimum Aggregate Undrawn Availability Excess Cash Flow Calculation			$ 5,000
Revolving Credit Facility
Deferred financing costs	$ 200
2022 term Loan Facility
Principal payments on term loan, percentage				5.00%
Minimum
Additional interest percentage	7.00%
Minimum \| Applicable leverage ratio
Additional interest percentage	6.00%
Minimum \| SOFR plus Applicable leverage ratio
Additional interest percentage					7.00%
Minimum \| Revolving credit facility Amendment \| SOFR
Additional interest percentage	2.36%
Minimum \| Revolving credit facility Amendment \| Prime commercial lending rate of Wells Fargo
Additional interest percentage	1.25%
Maximum \| SOFR plus Applicable leverage ratio
Additional interest percentage	8.00%
Maximum \| Revolving credit facility Amendment \| SOFR
Additional interest percentage	2.86%
Domestic rate loans \| Amended And Restated Revolving Credit And Security Agreement \| London Interbank Offered Rate Daily Libor [Member]
Debt Instrument, Basis Spread on Variable Rate			1.00%
Domestic rate loans \| Amended And Restated Revolving Credit And Security Agreement \| Federal Funds Purchased [Member]
Debt Instrument, Basis Spread on Variable Rate			0.50%
Domestic rate loans \| Minimum \| Amended And Restated Revolving Credit And Security Agreement
Additional interest percentage			1.25%
Domestic rate loans \| Maximum \| Amended And Restated Revolving Credit And Security Agreement
Additional interest percentage			1.75%
Eurodollar Rate Loans [Member] \| Minimum \| Amended And Restated Revolving Credit And Security Agreement \| Euro Dollar
Debt Instrument, Basis Spread on Variable Rate			2.25%
Eurodollar Rate Loans [Member] \| Maximum \| Amended And Restated Revolving Credit And Security Agreement \| Euro Dollar
Debt Instrument, Basis Spread on Variable Rate			2.75%
Wells Fargo
Line of credit facility term	5 years
Deferred financing costs	$ 900
Wells Fargo \| FILO Tranche
Amount borrowed	15,000
Wells Fargo \| FCCR [Member]
Minimum aggregate undrawn loan availability	$ 11,250
Period for FCCR covenant	12 months
Wells Fargo \| Amended And Restated Revolving Credit And Security Agreement
Line of Credit Facility, Maximum Borrowing Capacity	$ 75,000		$ 60,000
Wells Fargo \| Swing Line Loan [Member]
Line of Credit Facility, Maximum Borrowing Capacity			5,000	$ 9,000
Wells Fargo \| Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity			2,000	2,000
Wells Fargo \| Revolving Credit Facility
Minimum amount to be derived from availability			3,000
Minimum aggregate undrawn loan availability			$ 7,500
Wells Fargo \| Revolving Credit Facility \| FCCR [Member]
Fixed Charges Coverage Ratio			1.00
Period for FCCR covenant			2 months
Wells Fargo \| Minimum
Minimum amount to be derived from availability	$ 5,000
Wells Fargo \| Minimum \| FCCR [Member]
Fixed Charges Coverage Ratio	1.00
Wells Fargo \| Maximum
Minimum amount to be derived from availability	$ 3,000
Wells Fargo \| Maximum \| FCCR [Member]
Fixed Charges Coverage Ratio	1.00
Wells Fargo \| Maximum \| Revolving Credit Facility
Amount borrowed	$ 75,000
Revolver Guaranty and Security Agreement \| Wells Fargo
Right to dominion over certain borrower's bank accounts				$ 9,000