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INCOME TAXES - Deferred Tax Assets and Liabilities (Details) (USD $)
Dec. 28, 2012
Dec. 30, 2011
Deferred tax assets:    
Allowance for doubtful accounts $ 2,000,000 $ 2,400,000
Workers’ compensation claims reserve 10,100,000 9,700,000
Accounts payable and other accrued expenses 2,400,000 3,500,000
Net operating loss carry-forwards 600,000 500,000
Accrued wages and benefits 5,900,000 4,300,000
Deferred compensation 1,500,000 1,100,000
Other 500,000 800,000
Total 23,000,000 22,300,000
Valuation allowance (600,000) (500,000)
Total deferred tax asset, net of valuation allowance 22,400,000 21,800,000
Deferred tax liabilities:    
Prepaid expenses, deposits and other current assets (1,600,000) (1,100,000)
Depreciation and amortization (11,900,000) (8,800,000)
Other (900,000) (800,000)
Total deferred tax liabilities (14,400,000) (10,700,000)
Deferred Tax Assets, Net of Valuation Allowance, Classification [Abstract]    
Net deferred tax asset, end of year 8,000,000 11,100,000
Net deferred tax asset, current 5,447,000 6,300,000
Net deferred tax asset, non-current $ 2,562,000 $ 4,818,000