Cash, Cash Equivalents And Short Term Investments (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 03, 2014	Jan. 03, 2014
Fair Value Measurements [Line Items]
Amortized Cost	$ 141,591	$ 156,103
Unrealized Gains	36	25
Unrealized Losses	(4)	(9)
Estimated Fair Value	141,623	156,119
Cash
Fair Value Measurements [Line Items]
Amortized Cost	71,368	85,849
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	71,368	85,849
Money market securities
Fair Value Measurements [Line Items]
Amortized Cost	44,246	37,099
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	44,246	37,099
Total cash equivalents
Fair Value Measurements [Line Items]
Amortized Cost	44,246	37,099
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	44,246	37,099
Total cash and cash equivalents
Fair Value Measurements [Line Items]
Amortized Cost	115,614	122,948
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	115,614	122,948
State and municipal bonds
Fair Value Measurements [Line Items]
Amortized Cost	25,977	33,155
Unrealized Gains	36	25
Unrealized Losses	(4)	(9)
Estimated Fair Value	26,009	33,171
Total short-term investments
Fair Value Measurements [Line Items]
Amortized Cost	25,977	33,155
Unrealized Gains	36	25
Unrealized Losses	(4)	(9)
Estimated Fair Value	$ 26,009	$ 33,171