Cash, Cash Equivalents and Short-Term Investments and Long-Term Investments (Detail) - USD ($) $ in Thousands	Jul. 02, 2016	Jan. 02, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 40,597	$ 46,667
Unrealized Holdings Gains	20
Unrealized Holdings Losses	3	40
Fair Value	40,614	46,627
Cash and Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18,733	13,746
Fair Value	18,733	13,746
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,650	23,215
Unrealized Holdings Gains	8
Unrealized Holdings Losses	3	7
Fair Value	16,655	23,208
Short-term Investments | Corporate bonds and medium-term notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,651	9,978
Unrealized Holdings Gains	3
Unrealized Holdings Losses	1	7
Fair Value	6,653	9,971
Short-term Investments | Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,135	4,238
Unrealized Holdings Gains	1
Fair Value	3,136	4,238
Short-term Investments | U.S. treasury and agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,773	8,999
Unrealized Holdings Gains	4
Unrealized Holdings Losses	1
Fair Value	5,776	8,999
Other Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,214	9,706
Unrealized Holdings Gains	12
Unrealized Holdings Losses		33
Fair Value	5,226	9,673
Other Long-term Investments | Corporate bonds and medium-term notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,214	6,212
Unrealized Holdings Gains	12
Unrealized Holdings Losses		23
Fair Value	5,226	6,189
Other Long-term Investments | U.S. treasury and agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		3,494
Unrealized Holdings Losses		10
Fair Value		3,484
Cash
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,442	6,208
Fair Value	9,442	6,208
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,291	7,538
Fair Value	9,291	$ 7,538
Commercial Paper | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,091
Unrealized Holdings Losses	1
Fair Value	$ 1,090