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LONG-TERM DEBT Revolving Credit Facility Narrative (Details) - USD ($)
4 Months Ended 12 Months Ended
Jun. 01, 2016
May 01, 2016
Apr. 01, 2016
Jan. 04, 2016
Jun. 30, 2014
Sep. 23, 2016
Jan. 01, 2017
Dec. 25, 2015
Revolving Credit Facility [Line Items]                
Total             $ 137,629,000 $ 245,664,000
Bank of America, N.A. and Wells Fargo Capital Finance, LLC                
Revolving Credit Facility [Line Items]                
Total             $ 112,507,000 $ 218,086,000
Revolving credit facility, interest rate description         one-month      
Revolving credit facility, interest rate at period end             2.13%  
Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility                
Revolving Credit Facility [Line Items]                
Revolving Credit Facility, maximum borrowing capacity       $ 330,000,000.0 $ 300,000,000.0      
Revolving credit facility, current borrowing capacity             $ 256,400,000  
Revolving credit facility, amount outstanding             8,300,000  
Line of credit facility, increase (decrease), Net $ (10,000,000.0) $ 10,000,000 $ 10,000,000 30,000,000.0        
Revolving credit facility,, utilization threshold         25.00%      
Percent of Eligible Billed Accounts Receivable | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility                
Revolving Credit Facility [Line Items]                
Revolving credit facility borrowing limits, percent of accounts receivable         90.00%      
Percent of Eligible Unbilled Accounts Receivable | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility                
Revolving Credit Facility [Line Items]                
Revolving credit facility borrowing limits, percent of accounts receivable         85.00%      
Percent of Eligible Accounts Receivable | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility                
Revolving Credit Facility [Line Items]                
Revolving credit facility borrowing limits, percent of accounts receivable         15.00%      
Liquidation Value of Tacoma Headquarters Office Building | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility                
Revolving Credit Facility [Line Items]                
Revolving credit facility borrowing limits, liquidation value requirement, pledged real estate         $ 17,400,000      
Revolving credit facility borrowing limits, quarterly reduction, liquidation value of pledged real estate         $ 400,000      
Revolving credit facility borrowing limits, liquidation value of pledged real estate             13,100,000  
Revolving Credit Facility, Liquidity Requirement Component | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility                
Revolving Credit Facility [Line Items]                
Revolving credit facility, remaining borrowing capacity             135,600,000  
Revolving credit facility, cash and cash equivalents under control agreements             27,900,000  
Revolving credit facility, total liquidity             $ 163,500,000  
London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility                
Revolving Credit Facility [Line Items]                
Revolving credit facility, additional base rate         1.00%   1.50%  
Letters of credit, additional basis rate         0.125%      
Base rate [Member] | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility                
Revolving Credit Facility [Line Items]                
Revolving credit facility, additional base rate         0.50%   0.625%  
Minimum | Revolving Credit Facility, Liquidity Requirement Component | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility                
Revolving Credit Facility [Line Items]                
Revolving credit facility, liquidity requirement   $ 28,600,000 $ 19,300,000 $ 10,000,000 $ 37,500,000 $ 37,500,000    
Minimum | London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility                
Revolving Credit Facility [Line Items]                
Debt Instrument, basis spread on variable rate         1.25%      
Minimum | Base rate [Member] | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility                
Revolving Credit Facility [Line Items]                
Debt Instrument, basis spread on variable rate         0.25%      
Maximum | London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility                
Revolving Credit Facility [Line Items]                
Debt Instrument, basis spread on variable rate         2.00%      
Maximum | Base rate [Member] | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility                
Revolving Credit Facility [Line Items]                
Debt Instrument, basis spread on variable rate         1.00%      
Less than 25% utilization [Member] | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility                
Revolving Credit Facility [Line Items]                
Revolving credit facility, unused capacity, commitment fee percentage         0.375%      
Greater than or equal to 25% utilization [Member] | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility                
Revolving Credit Facility [Line Items]                
Revolving credit facility, unused capacity, commitment fee percentage         0.25%