Cash, Cash Equivalents and Short-Term Investments and Long-Term Investments (Detail) - USD ($) $ in Thousands	Jan. 02, 2016	Jan. 03, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 46,667	$ 68,623
Unrealized Holdings Gains		19
Unrealized Holdings Losses	40	20
Fair Value	46,627	68,622
Cash and Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,746	21,482
Fair Value	13,746	21,482
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,215	29,590
Unrealized Holdings Gains		15
Unrealized Holdings Losses	7	7
Fair Value	23,208	29,598
Short-term Investments | Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,995
Unrealized Holdings Gains		2
Fair Value		2,997
Short-term Investments | Corporate bonds and medium-term notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,978	21,203
Unrealized Holdings Gains		2
Unrealized Holdings Losses	7	6
Fair Value	9,971	21,199
Short-term Investments | Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,238	5,392
Unrealized Holdings Gains		11
Unrealized Holdings Losses		1
Fair Value	4,238	5,402
Short-term Investments | U.S. treasury and agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,999
Fair Value	8,999
Other Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,706	17,551
Unrealized Holdings Gains		4
Unrealized Holdings Losses	33	13
Fair Value	9,673	17,542
Other Long-term Investments | Corporate bonds and medium-term notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,212	6,266
Unrealized Holdings Gains		1
Unrealized Holdings Losses	23	4
Fair Value	6,189	6,263
Other Long-term Investments | Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,290
Unrealized Holdings Losses		8
Fair Value		2,282
Other Long-term Investments | U.S. treasury and agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,494	8,995
Unrealized Holdings Gains		3
Unrealized Holdings Losses	10	1
Fair Value	3,484	8,997
Cash
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,208	4,948
Fair Value	6,208	4,948
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,538	16,534
Fair Value	$ 7,538	$ 16,534