Accounts payable and accrued liabilities - Narrative (Details) - USD ($) $ in Millions		9 Months Ended
	Mar. 25, 2024	Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, payment extensions, term of original payment		1 year
Restructuring and related cost, number of positions expected to be eliminated, percent	17.00%
Cost of Sales
Restructuring Cost and Reserve [Line Items]
Severance costs		$ 0.8
Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Severance costs		5.6
Accrued Salaries
Restructuring Cost and Reserve [Line Items]
Severance costs		$ 3.7