Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Jan. 01, 2016	Dec. 26, 2014
Current:
Allowances and other accrued liabilities	$ (0.9)	$ (2.7)
Inventories	(14.0)	(15.6)
Total current deferred tax liabilities	(14.9)	(18.3)
Noncurrent:
Property, plant and equipment	(64.6)	(64.7)
Equity in earnings of unconsolidated companies	(0.2)	(0.2)
Pension	(2.9)	(2.8)
Other noncurrent deferred tax liabilities	(6.4)	(6.3)
Total noncurrent deferred tax liabilities	(74.1)	(74.0)
Total current and noncurrent deferred tax liabilities	(89.0)	(92.3)
Current:
Net operating loss carryforwards	6.8	6.4
Allowances and other accrued assets	11.3	13.2
Inventories	5.0	4.8
Total current deferred tax assets	23.1	24.4
Valuation allowance	(11.2)	(12.1)
Total net current deferred tax assets	11.9	12.3
Noncurrent:
Pension liability	21.1	22.1
Property, plant and equipment	2.0	2.4
Post-retirement benefits other than pension	0.7	0.3
Net operating loss carryforwards	209.1	158.8
Capital loss carryover	3.0	3.5
Other noncurrent assets	21.3	26.1
Total noncurrent deferred tax assets	257.2	213.2
Valuation allowance	(214.6)	(167.4)
Total net noncurrent deferred tax assets	42.6	45.8
Total deferred tax assets, net	54.5	58.1
Net deferred tax liabilities	$ (34.5)	$ (34.2)