Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
NET INCOME (LOSS)	$ (1,402)us-gaap_NetIncomeLoss	$ 5,290us-gaap_NetIncomeLoss	$ (927)us-gaap_NetIncomeLoss
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Unrealized gain (loss) on interest rate swaps	(1,928)	236	(476)
Reclassification of loss into earnings from interest rate swaps	231	176	98
Amortization of unrealized loss on dedesignated interest rate swaps	0	98	289
Unrecognized net actuarial gain on postretirement benefit plans	41	20	20
Reclassification of net actuarial gain into earnings from postretirement benefit plans	(19)	(22)	(27)
Reclassification of prior service credits into earnings from postretirement benefit plans	(54)	(54)	(54)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(1,729)	454	(150)
COMPREHENSIVE INCOME (LOSS)	$ (3,131)us-gaap_ComprehensiveIncomeNetOfTax	$ 5,744us-gaap_ComprehensiveIncomeNetOfTax	$ (1,077)us-gaap_ComprehensiveIncomeNetOfTax

Other Comprehensive Income (Loss), Amortization of Unrealized Losses on Dedesignated Derivatives, Net of Tax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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Amount after tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount after tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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