Fair Value of Financial Instruments Unobservable Inputs (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 28, 2014	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of securities sold	$ 5,200
Realized gain from sale of marketable securities				$ 1,700
Realized gain on sale of auction rate securities, previously unrealized, net of tax		$ 0	$ 0	$ 1,147
Level 1 | Short Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized loss		$ 200
Level 1 | Short Term | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized loss			$ 100
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sale of securities	5,500
Federally-Insured OR FFELP Guaranteed Student Loan Auction Rate Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Par value of available for sale securities	$ 5,700