Income Tax (Benefit) Expense (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010	Dec. 27, 2008
Income Taxes [Line Items]
Increase in equity, estimated	$ 2.0
Operating loss carryforwards	278.7
Capital loss carry forwards	2.7
Credit carryforwards	1.4
Valuation allowance	22.2	12.7
Realize future income tax benefit due to reversal of the valuation allowance	10.3	1.0	(22.7)
Unrecognized tax benefits	9.0	13.3	14.7	38.7
Decrease in unrecognized tax benefits	4.3
Favorable impact of effective tax rate	4.0
Significant change in unrecognized tax benefits	1.2
Interest and penalties recovered, unrecognized tax benefits	0.2	0.2	2.1
Interest and penalties recognized as an asset		3.1	2.7
U.S. Federal [Member]
Income Taxes [Line Items]
Operating loss carryforwards	68.8
Credit carryforwards	0.8
Alternative minimum tax credit carryforward	0.6
Valuation allowance	12.0
State And Local [Member]
Income Taxes [Line Items]
Operating loss carryforwards	192.0
Credit carryforwards, expiration date		2014 to 2017
Mexico [Member]
Income Taxes [Line Items]
Operating loss carryforwards	17.9
Valuation allowance	7.5
Canada [Member]
Income Taxes [Line Items]
Valuation allowance	2.7
Unrecognized tax benefits	5.2
Minimum [Member] | U.S. Federal [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	2027
Minimum [Member] | State And Local [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	2012
Minimum [Member] | Mexico [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	2018
Maximum [Member] | U.S. Federal [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	2031
Maximum [Member] | State And Local [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	2031
Maximum [Member] | Mexico [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	2021
Proposed Scenario [Member]
Income Taxes [Line Items]
Realize future income tax benefit due to reversal of the valuation allowance	22.2
Current Assets [Member]
Income Taxes [Line Items]
Recovery of tax and interest, offsetting jurisdictional benefits	$ 8.5