Cash, Cash Equivalents And Short Term Investments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 03, 2014	Dec. 28, 2012
Fair Value Measurements [Line Items]
Amortized Cost	$ 156,103	$ 134,109
Unrealized Gains	25	41
Unrealized Losses	(9)	(1)
Estimated Fair Value	156,119	134,149
Cash
Fair Value Measurements [Line Items]
Amortized Cost	85,849	64,134
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	85,849	64,134
Money market securities
Fair Value Measurements [Line Items]
Amortized Cost	37,099	49,134
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	37,099	49,134
Total cash equivalents
Fair Value Measurements [Line Items]
Amortized Cost	37,099	49,134
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	37,099	49,134
Total cash and cash equivalents
Fair Value Measurements [Line Items]
Amortized Cost	122,948	113,268
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	122,948	113,268
State and municipal bonds
Fair Value Measurements [Line Items]
Amortized Cost	33,155	20,841
Unrealized Gains	25	41
Unrealized Losses	(9)	(1)
Estimated Fair Value	33,171	20,881
Total short-term investments
Fair Value Measurements [Line Items]
Amortized Cost	33,155	20,841
Unrealized Gains	25	41
Unrealized Losses	(9)	(1)
Estimated Fair Value	$ 33,171	$ 20,881