INCOME TAXES - Income Tax Reconciliation (Details) (USD $)	12 Months Ended
Dec. 28, 2012	Dec. 30, 2011	Dec. 31, 2010
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income tax expense based on statutory rate	$ 19,100,000	$ 17,200,000	$ 10,200,000
Increase (decrease) resulting from:
State income taxes, net of federal benefit	1,800,000	1,900,000	1,900,000
Tax credits, net	(1,900,000)	(3,500,000)	(4,600,000)
Nondeductible/nontaxable Items	2,300,000	2,900,000	2,300,000
Other, net	(300,000)	0	(500,000)
Total taxes on income	$ 21,000,000	$ 18,500,000	$ 9,300,000
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Income tax expense based on statutory rate	35.00%	35.00%	35.00%
Increase (decrease) resulting from:
State income taxes, net of federal benefit	3.30%	3.90%	7.00%
Tax credits, net	(3.50%)	(7.20%)	(16.00%)
Nondeductible/nontaxable Items	4.20%	5.80%	8.00%
Other, net	(0.60%)	0.10%	(2.00%)
Total taxes on income	38.40%	37.60%	32.00%

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate attributable to all nondeductible expenses under enacted tax laws.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense or benefit, net of the federal tax benefit (expense) thereon, recorded during the period.

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The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate that can be explained by all tax credits generated or utilized under enacted tax laws during the period.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to pretax Income or Loss from continuing operations; income tax expense or benefit may include interest and penalties on tax uncertainties based on the entity's accounting policy.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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The sum of the differences between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to nondeductible expenses under enacted tax laws, or differences in the methodologies used to determine expense amounts for financial statements prepared in accordance with generally accepted accounting principles and enacted tax laws.

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The sum of other amounts reflected in the reconciliation of the statutory tax provision (benefit) to the actual tax provision (benefit).

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to state and local income tax expense or benefit.

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