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LONG-TERM DEBT Revolving Credit Facility Narrative (Details) - USD ($)
4 Months Ended 9 Months Ended
Jun. 01, 2016
May 01, 2016
Apr. 01, 2016
Jan. 04, 2016
Jun. 30, 2014
Sep. 23, 2016
Sep. 23, 2016
Dec. 25, 2015
Revolving Credit Facility [Line Items]                
Long-term debt           $ 139,378,000 $ 139,378,000 $ 245,664,000
Bank of America, N.A. and Wells Fargo Capital Finance, LLC                
Revolving Credit Facility [Line Items]                
Long-term debt           $ 113,500,000 $ 113,500,000 $ 218,086,000
Revolving credit facility, interest rate description         one-month      
Revolving credit facility, interest rate at period end           2.38% 2.38%  
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      
Revolving credit facility, current borrowing capacity           $ 272,900,000 $ 272,900,000  
Revolving credit facility, amount outstanding           4,800,000 4,800,000  
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 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%      
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%      
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           14,000,000 14,000,000  
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           154,600,000 154,600,000  
Revolving credit facility, cash and cash equivalents under control agreements           19,700,000 19,700,000  
Revolving credit facility, total liquidity           174,300,000 $ 174,300,000  
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%   1.75%  
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%