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

12 Months Ended

Dec. 27, 2014

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 27, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Municipal securities	$	155	$	—	$	—	$	155
Bank certificates of deposit		1,000		—		—		1,000
	$	1,155	$	—	$	—	$	1,155
	At December 28, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Municipal securities	$	1,200	$	—	$	—	$	1,200

Effective Maturities of Short-Term Investments

Effective maturities of short-term investments at December 27, 2014, were as follows:

(in thousands)	Amortized Cost		Estimated Fair Value
Due in one year or less	$	1,155	$	1,155

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 27, 2014 using:
	Level 1		Level 2		Level 3		Total estimated fair value
Cash	$	66,467	$	—	$	—	$	66,467
Municipal securities		—		155		—		155
Money market funds		—		4,418		—		4,418
Bank certificates of deposit		—		1,000		—		1,000
	$	66,467	$	5,573	$	—	$	72,040
	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