Cash, Cash Equivalents and Short-term Investments (Tables)

12 Months Ended

Dec. 28, 2013

Cash And Cash Equivalents [Abstract]

Short-Term Investments by Security Type

Investments that we have classified as short-term, by security type, are as follows (in thousands):

	At December 28, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Municipal securities	$	1,200	$	—	$	—	$	1,200

	At December 29, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Municipal securities	$	1,470	$	—	$	—	$	1,470
Government-sponsored enterprise securities		5,937		14		—		5,951
	$	7,407	$	14	$	—	$	7,421

Effective Maturities of Short-Term Investments

Effective maturities of short-term investments at December 28, 2013, were as follows:

(in thousands)	Amortized Cost		Estimated Fair Value
Due in one year or less	$	1,200	$	1,200

Assets Measured at Fair Value on Recurring Basis

The following table summarizes, by major security type, our assets that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy (in thousands):

	Fair value measurements at December 28, 2013 using:
	Level 1		Level 2		Level 3		Total estimated fair value
Cash	$	44,165	$	—	$	—	$	44,165
Municipal securities		—		1,200		—		1,200
Money market funds		—		7,503		—		7,503
	$	44,165	$	8,703	$	—	$	52,868

	Fair value measurements at December 29, 2012 using:
	Level 1		Level 2		Level 3		Total estimated fair value
Cash	$	101,054	$	—	$	—	$	101,054
Municipal securities		—		1,470		—		1,470
Government-sponsored enterprise securities		—		5,951		—		5,951
Money market funds		—		1,754		—		1,754
	$	101,054	$	9,175	$	—	$	110,229