Income Taxes (Narrative) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Valuation Allowance [Line Items]
Income before income taxes	$ 13,022,000	$ 29,545,000	$ 33,293,000	$ 23,793,000	$ 32,893,000	$ 15,393,000	$ (6,009,000)	$ 17,568,000	$ 99,653,000	$ 59,845,000	$ 8,162,000
Retained earnings	50,847,000				35,539,000				50,847,000	35,539,000
Valuation allowance	485,000				408,000				485,000	408,000
Tax Credit Carryforward, Valuation Allowance	200,000								200,000
Operating Loss Carryforwards, Valuation Allowance	300,000								300,000
Gross unrecognized tax benefits	6,031,000				6,139,000				6,031,000	6,139,000	3,850,000
Amount, if recognized, that affects the effective tax rate	6,700,000								6,700,000
Potential reduction in unrecognized tax benefit	2,100,000								2,100,000
Interest and penalties related to unrecognized tax benefits in noncurrent liabilities	2,300,000								2,300,000
Valuation Allowance of Deferred Tax Assets [Member]
Valuation Allowance [Line Items]
Valuation Allowances and Reserves, Charged to Cost and Expense										408,000	307,000	[1]
Valuation Allowances and Reserves, Deductions										500,000	0
Valuation Allowance, Tax Credit Carryforward [Member]
Valuation Allowance [Line Items]
Valuation Allowances and Reserves, Deductions									228,000
Valuation Allowance, Operating Loss Carryforwards [Member]
Valuation Allowance [Line Items]
Valuation Allowances and Reserves, Charged to Cost and Expense									305,000
Canada [Member]
Valuation Allowance [Line Items]
Income before income taxes									4,900,000	5,900,000	4,600,000
Retained earnings	8,100,000				4,400,000				8,100,000	4,400,000
State and Local Jurisdiction [Member]
Valuation Allowance [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	7,000,000								7,000,000
Tax Credit Carryforward, Amount	$ 200,000								$ 200,000

[1] Represents $452 assumed from the Merger with Snyder’s, offset by $145 reduction to expense.