Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 27, 2024	Dec. 29, 2023
Deferred tax liabilities:
Allowances and other accrued liabilities	$ (0.5)	$ (0.2)
Inventories	(16.8)	(14.8)
Property, plant and equipment	(69.8)	(69.7)
Equity in earnings of unconsolidated companies	(2.7)	(0.5)
Pension obligations	(2.7)	(2.7)
Other noncurrent deferred tax liabilities	(26.8)	(28.1)
ROU assets	(17.8)	(21.6)
Total noncurrent deferred tax liabilities	(137.1)	(137.6)
Deferred tax assets:
Allowances and other accrued assets	19.0	13.9
Inventories	6.2	9.6
Pension obligations	23.2	22.4
Property, plant and equipment	2.9	3.6
Post-retirement benefits other than pension	2.8	2.7
Net operating loss carryforwards	408.0	434.5
Capital loss carryover	3.2	2.2
Other noncurrent assets	124.5	129.7
Operating lease	19.4	23.5
Total noncurrent deferred tax assets	609.2	642.1
Valuation allowance	(499.8)	(525.7)
Total deferred tax assets, net	109.4	116.4
Net deferred tax liabilities	$ (27.7)	$ (21.2)