Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
General Accounting Policies [Line Items]
Allowance for doubtful accounts receivable, current	$ 5,200,000	$ 4,800,000	$ 5,500,000
Percentage of LIFO inventory	70.00%	67.00%	77.00%
Effect of LIFO inventory, decrease in cost of goods sold	800,000		1,500,000
Inventory, LIFO Reserve	25,472,000	25,901,000	23,837,000
Intangibles net of amortization	87,000,000
Product development costs	26,900,000	23,100,000	21,800,000
Freight expense	122,100,000	112,300,000	97,800,000
Accumulated earnings permanently reinvested	25,300,000
Antidilutive securities excluding from computation of earnings per share	1,760,220	1,969,085	1,439,911
Insurance liabilities	$ 25,700,000
Land Improvements [Member] | Minimum [Member]
General Accounting Policies [Line Items]
Useful life, minimum	10 years
Land Improvements [Member] | Maximum [Member]
General Accounting Policies [Line Items]
Useful life, minimum	20 years
Buildings [Member] | Minimum [Member]
General Accounting Policies [Line Items]
Useful life, minimum	10 years
Buildings [Member] | Maximum [Member]
General Accounting Policies [Line Items]
Useful life, minimum	40 years
Machinery and Equipment [Member] | Minimum [Member]
General Accounting Policies [Line Items]
Useful life, minimum	3 years
Machinery and Equipment [Member] | Maximum [Member]
General Accounting Policies [Line Items]
Useful life, minimum	12 years