Income Taxes (Deferred Income Tax Assets and Liabilities) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 27, 2013	Dec. 28, 2012
Current:
Allowances and other accrued liabilities	$ (1.3)	$ (1.4)
Inventories	(14.4)	(14.5)
Total current tax liabilities	(15.7)	(15.9)
Noncurrent:
Property, plant and equipment	(68.1)	(69.8)
Equity in earnings of unconsolidated companies	(0.2)	(0.2)
Deferred Tax Liabilities, Other Comprehensive Income	3.6	2.4
Other noncurrent liabilities	(7.3)	(5.3)
Total noncurrent deferred tax liabilities	(79.2)	(77.7)
Total current and noncurrent deferred tax liabilities	(94.9)	(93.6)
Current:
Net operating loss carryforwards	3.1	4.3
Allowances and other accrued assets	13.0	13.0
Inventories	3.7	5.0
Total current deferred tax assets	19.8	22.3
Valuation allowance	(9.0)	(10.5)
Total net current deferred tax assets	10.8	11.8
Noncurrent:
Pension liability	20.2	22.5
Property, plant and equipment	4.0	4.1
Post-retirement benefits other than pension	0.5	0.8
Net operating loss carryforwards	162.9	168.7
Capital loss carryover	3.1	2.9
Other noncurrent assets	33.1	27.6
Total noncurrent deferred tax assets	223.8	226.6
Valuation allowance	(171.4)	(170.1)
Total net noncurrent deferred tax assets	52.4	56.5
Total deferred tax assets, net	63.2	68.3
Net deferred tax liabilities	$ (31.7)	$ (25.3)