Summary of Significant Accounting Policies (Cash, Cash Equivalents and Investments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	$ 41,782	$ 72,812	$ 99,096	$ 87,374
Short-term Investments	7,250	9,157	10,567
Long-term Investments	13,356	10,714	0
Certificates of Deposit [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	0	0	0
Short-term Investments	250	257	255
Long-term Investments	0	0	0
Debt Securities [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	0	0	0
Short-term Investments	7,000	8,900	9,607
Long-term Investments	13,356	10,714	0
Investments in Target Fund [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents			0
Short-term Investments			705
Long-term Investments			0
Cash and Money Markets Accounts [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	41,782	72,812	99,096
Short-term Investments	0	0	0
Long-term Investments	$ 0	$ 0	$ 0