Marketable Securities Composition (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 28, 2013 Federally-insured or FFELP guaranteed student loan auction rate securities	May 22, 2012 Federally-insured or FFELP guaranteed student loan auction rate securities	Mar. 29, 2011 Federally-insured or FFELP guaranteed student loan auction rate securities	Dec. 28, 2013 Short-term marketable securities Corporate and government bonds and notes and commercial paper	Dec. 29, 2012 Short-term marketable securities Corporate and government bonds and notes and commercial paper	Dec. 28, 2013 Long-term marketable securities Federally-insured or FFELP guaranteed student loan auction rate securities	Dec. 29, 2012 Long-term marketable securities Federally-insured or FFELP guaranteed student loan auction rate securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	$ 106,746	$ 69,582	$ 5,241	$ 2,300	$ 2,800	$ 101,505	$ 64,865	$ 5,241	$ 4,717