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Long-term debt Debt Instrument (Details) - USD ($)
Sep. 29, 2014
Oct. 03, 2015
Jan. 03, 2015
Line of Credit Facility [Line Items]      
Capital Lease Obligations, Noncurrent   $ 100,000 $ 145,000
Long-term Debt and Capital Lease Obligations   190,100,000 125,145,000
Adjusted London Interbank Offered Rate (LIBOR) | Minimum      
Line of Credit Facility [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.125%    
Adjusted London Interbank Offered Rate (LIBOR) | Maximum      
Line of Credit Facility [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 2.00%    
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Increase to borrowing capacity $ 125,000,000.0    
Line of Credit Facility, Current Borrowing Capacity 250,000,000    
Line of Credit Facility, Maximum Borrowing Capacity 350,000,000    
Line of Credit Facility, Maximum Sublimit $ 50,000,000.0    
Long-term Line of Credit, Noncurrent   $ 190,000,000 $ 125,000,000
Revolving Credit Facility [Member] | Base Rate | Minimum      
Line of Credit Facility [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.125%    
Revolving Credit Facility [Member] | Base Rate | Maximum      
Line of Credit Facility [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.00%    
Revolving Credit Facility [Member] | Foreign Line of Credit      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Sublimit $ 75,000,000.0    
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Interest Rate at Period End   1.50%  
Revolving Credit Facility [Member] | Minimum      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.175%    
Revolving Credit Facility [Member] | Maximum      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.30%    
Revolving Credit Facility [Member] | One Month Adjusted London Interbank Offered Rate (LIBOR)      
Line of Credit Facility [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.00%    
Revolving Credit Facility [Member] | Federal Fund      
Line of Credit Facility [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.50%