Summary of Significant Accounting Policies (Cash, Cash Equivalents and Investments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010	Jan. 03, 2009
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	$ 72,812	$ 99,096	$ 87,374	$ 39,538
Short-term Investments	9,157	10,567	5,994
Long-term Investments	10,714	0	0
Certificates of Deposit [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	0	0	0
Short-term Investments	257	255	250
Long-term Investments	0	0	0
Debt Securities [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	0	0
Short-term Investments	8,900	9,607
Long-term Investments	10,714	0
Investments in Target Fund [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents		0	0
Short-term Investments		705	5,744
Long-term Investments		0	0
Cash and Money Markets Accounts [Member]
Schedule of Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	72,812	99,096	87,374
Short-term Investments	0	0	0
Long-term Investments	$ 0	$ 0	$ 0