INCOME TAXES - Income Tax Reconciliation (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 27, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 28, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 27, 2013	Dec. 28, 2012	Dec. 30, 2011
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax expense based on statutory rate									$ 21,300,000	$ 19,100,000	$ 17,200,000
Increase (decrease) resulting from:
State income taxes, net of federal benefit									2,500,000	1,800,000	1,900,000
Tax credits, net									(10,800,000)	(1,900,000)	(3,500,000)
Nondeductible/nontaxable items									2,100,000	2,300,000	2,900,000
Other, net									900,000	(300,000)	0
Provision for income taxes	$ 6,889,000	$ 9,454,000	$ 5,069,000	$ (5,399,000)	$ 3,503,000	$ 8,998,000	$ 7,356,000	$ 1,119,000	$ 16,013,000	$ 20,976,000	$ 18,533,000
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income tax expense based on statutory rate									35.00%		35.00%
Increase (decrease) resulting from:
State income taxes, net of federal benefit									4.20%	3.30%	3.90%
Tax credits, net									(17.70%)	(3.50%)	(7.20%)
Nondeductible/nontaxable items									3.50%	4.20%	5.80%
Other, net									1.30%	(0.60%)	0.10%
Total taxes on income									26.30%	38.40%	37.60%