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LONG-TERM DEBT (Details) (USD $)
 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Jan. 01, 2011
Dec. 31, 2011
Jan. 01, 2011
Dec. 31, 2010
Jan. 02, 2010
Oct. 15, 2010
Jan. 02, 2010
Interest Rate Collar agreement [Member]
Dec. 31, 2011
Interest Rate Collar agreement [Member]
Jan. 01, 2011
Interest Rate Swap Agreement [Member]
Jan. 02, 2010
Interest Rate Swap Agreement [Member]
Dec. 31, 2011
Line of Credit BOA [Member]
Dec. 22, 2011
Line of Credit BOA [Member]
Oct. 15, 2010
Line of Credit BOA [Member]
Dec. 31, 2011
Letter of Credit BOA [Member]
Oct. 15, 2010
Letter of Credit BOA [Member]
Oct. 15, 2010
Swingline BOA [Member]
Jan. 01, 2011
Former credit facility [Member]
Dec. 22, 2011
Multicurrency credit facility [Member]
Dec. 22, 2011
Multicurrency letter of credit sublimit [Member]
Dec. 22, 2011
Multicurreny swingline [Member]
LONG-TERM DEBT [Abstract]                                        
Revolving credit facility $ 236,000,000 $ 236,000,000 $ 236,000,000                                  
Current maturities 0 0 0                                  
Total long-term debt 236,000,000 236,000,000 236,000,000                                  
Debt Instrument [Line Items]                                        
Maximum borrowing capacity                         375,000,000.0   130,000,000.0 40,000,000.0        
Available under the revolver for future borrowings                         130,000,000.0              
Transaction fees and expenses associated with former term loan payoff                                 3,800,000.0      
Outstanding letters of credit                           14,900,000.0 8,600,000.0          
Unamortized debt issuance costs written off 1,200,000.0                                      
Capitalized debt issuance costs                         3,500,000.0              
Debt issuance cost amortization period (in years)           5                            
Effective interest rate (in hundredths)                     2.50%                  
Revolving credit facility interest rate description  
The revolving credit facility provides for two pricing options for U.S. dollar facility revolving loans: (i) revolving loans on which interest is payable quarterly at a base rate equal to the highest of (x) the Federal Funds Rate plus half of 1%, (y) the rate of interest in effect for such day as publicly announced from time to time by Bank of America, N.A. as its prime rate, or (z) the Eurodollar Rate plus 1%, plus, in each case, an applicable margin initially equal to 1.25%, which may be adjusted based upon a leverage-based pricing grid ranging from 1.00% to 1.50% and (ii) revolving loans on which interest accrues for one, two, three, six or if, generally available, nine or twelve month interest periods (but is payable not less frequently than every three months) at a rate of interest per annum equal to an adjusted British Bankers Association LIBOR rate, plus an applicable margin initially equal to 2.25%, which may be adjusted based upon a leverage-based pricing grid ranging from 2.00% to 2.50%.
 
The revolving credit facility also provides for two pricing options for multicurrency facility revolving loans denominated in U.S. dollars: (i) revolving loans on which interest is payable quarterly at a base rate equal to the highest of (x) the Federal Funds Rate plus half of 1%, (y) the rate of interest in effect for such day as publicly announced from time to time by Bank of America, N.A., Canada Branch in Toronto as its reference rate for loans in U.S. dollars to its Canadian borrowers, or (z) the Eurodollar Rate plus 1%, plus, in each case, an applicable margin initially equal to 1.25%, which may be adjusted based upon a leverage-based pricing grid ranging from 1.00% to 1.50% and (ii) revolving loans on which interest accrues for one, two, three, six or if, generally available, nine or twelve month interest periods (but is payable not less frequently than every three months) at a rate of interest per annum equal to an adjusted British Bankers Association LIBOR rate, plus an applicable margin initially equal to 2.25%, which may be adjusted based upon a leverage-based pricing grid ranging from 2.00% to 2.50%.

In addition, the revolving credit facility provides for two pricing options for multicurrency facility revolving loans denominated in Canadian dollars: (i) revolving loans on which interest is payable quarterly at a base rate equal to the highest of (x) the rate of interest in effect for such day as publicly announced from time to time by Bank of America, N.A., Canada Branch in Toronto as its prime rate for loans in Canadian Dollars to Canadian Borrowers and (y) the rate of interest in effect for such day for Canadian dollar bankers' acceptances having a term of one month that appears on the Reuters Screen CDOR Page plus half of 1%, plus, in each case, an applicable margin initially equal to 1.25%, which may be adjusted based upon a leverage-based pricing grid ranging from 1.00% to 1.50%, and (ii) revolving loans on which interest accrues for one, two, three, six or if, generally available, nine or twelve month interest periods (but is payable not less frequently than every three months) at a rate of interest per annum equal to an adjusted British Bankers Association LIBOR rate, plus an applicable margin initially equal to 2.25%, which may be adjusted based upon a leverage-based pricing grid ranging from 2.00% to 2.50%.  Amounts outstanding under the revolving credit facility currently accrue interest at a LIBOR rate plus 2.25%.
                                    
Covenant terms   The revolving credit facility contains and defines financial covenants, including a lease adjusted leverage ratio (defined as, with certain adjustments, the ratio of the Company's consolidated indebtedness plus six times rent expense to consolidated net income before interest, taxes, depreciation, amortization, and rent expense ("EBITDAR")) to exceed (x) if such period ends on or before December 31, 2014, 3.75:1.00 and (y) if such period ends after December 31, 2014, 3.50:1.00; and consolidated fixed charge coverage ratio (defined as, with certain adjustments, the ratio of consolidated EBITDAR to consolidated fixed charges (defined as interest plus rent expense)), for any such period to be less than 2.75:1.00.                                     
Amount drawn upon from new BOA credit facility to pay off company's former term loan       232,200,000.0                                
Applicable rate of interest on borrowed funds                     0.0225                  
Waiver fee related to untimely filing of financial statements         450,000                              
Amended revolving facility borrowing capacity                       340,000,000.0           35,000,000.0 15,000,000.0 5,000,000.0
Derivative [Line Items]                                        
Amount of debt which was hedged by interest rate derivatives               100,000,000.0                        
Interest expense related to interest rate swap agreements   7,534,000 10,445,000   12,004,000       1,700,000.0 2,500,000.0                    
Interest rate collar agreement, rate floor (in hundredths)               4.30%                        
Interest rate collar agreement, rate ceiling (in hundredths)               5.50%                        
Percent of debt required to be hedged under former credit facility (in hundredths)   25.00%                                    
Number of interest rate swap agreements terminated 2   2                                  
Interest rate swap agreements early termination     100,000,000.0                                  
Interest expense related to derivative             $ 500,000.0