Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Income Taxes [Line Items]
Unrecognized Tax Benefits	$ 200,000	$ 100,000
Current:
Federal	58,903,000	21,491,000	11,741,000
State	13,461,000	4,356,000	2,702,000
Foreign	467,000	0	0
Deferred:
Federal and State	30,045,000	253,000	10,646,000
Income Tax Expense (Benefit), Continuing Operations	102,876,000	26,100,000	25,089,000
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed "expected" tax expense	95,303,000	24,620,000	23,408,000
State income taxes	10,621,000	2,679,000	2,491,000
Section 199 deduction	(5,306,000)	(2,079,000)	(744,000)
Non-deductible employee compensation	778,000	363,000	201,000
Tax credits	(58,000)	(80,000)	(441,000)
Reversal of reserve for taxes	44,000	(52,000)	(212,000)
Other, net	1,494,000	649,000	386,000
Deferred tax assets:
Net operating loss carryforwards	1,515,000	1,754,000
Loss contingency reserves	8,867,000	9,941,000
Employee benefits	3,380,000	3,453,000
Pension liability	19,000,000	12,623,000
Intangible assets amortization, including taxable goodwill	2,957,000	233,000
Other	9,477,000	6,705,000
Total gross deferred tax assets	45,196,000	34,709,000
Less valuation allowance	(46,000)	(45,000)
Net deferred tax assets	45,150,000	34,664,000
Deferred tax liabilities:
Intangible assets amortization, including taxable goodwill	(14,152,000)	0
Property, plant and equipment depreciation	(43,472,000)	(23,192,000)
Other	(11,194,000)	(10,438,000)
Total gross deferred tax liabilities	68,818,000	33,630,000
Deferred Tax Assets (Liabilities), Net	(23,668,000)	1,034,000
Operating Loss Carryforwards Limitation on Use Per Year	700,000
Internal Revenue Service (IRS) [Member]
Deferred tax liabilities:
Operating Loss Carryforwards	4,000,000
Minimum [Member]
Income Taxes [Line Items]
Likelihood Of Tax Benefit Being Realized In Earning Upon Settlement, Percent	50.00%
Minimum [Member] | State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Period of open tax years for state tax audits	3 years
Maximum [Member]
Income Taxes [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 200,000	$ 100,000
Maximum [Member] | State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Period of open tax years for state tax audits	5 years