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Fair Value of Financial Instruments Unobservable Inputs (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 28, 2014
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Ending fair value of Long-term marketable securities $ 5,200      
Marketable Securities, Realized Gain (Loss)     $ 1,700  
Realized gain on sale of auction rate securities, previously unrealized, net of tax   $ 0 1,147 $ 0
Level 1 | Short Term | Maximum        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Unrealized loss   100 400  
Level 3        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning fair value of Long-term marketable securities   0 5,241  
Fair value of securities sold or redeemed (5,500) 0 (5,488)  
Realized gain from increase in fair value   0 247  
Ending fair value of Long-term marketable securities   $ 0 $ 0 $ 5,241
Federally-Insured OR FFELP Guaranteed Student Loan Auction Rate Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Par Value Of Available For Sale Securities $ 5,700