Fair Value Measurements (Tables)

9 Months Ended

Sep. 27, 2014

Fair Value Measurements [Abstract]

Financial Assets Measured At Fair Value On Recurring Basis

	Fair value,
	September 27, 2014
(in thousands)	Level 1		Level 2
Assets:
Money market funds	$	12,166	$	—
Corporate bonds and notes		74,853		22,120
United States (“US”) treasury and government agency notes		37,888		887
Foreign government and agency notes		—		2,540
US state and municipal securities		—		231
Total assets	$	124,907	$	25,778
	Fair value,
	December 28, 2013
(in thousands)	Level 1		Level 2
Assets:
Money market funds	$	14,629	$	—
Corporate bonds and notes		79,653		3,166
US treasury and government agency notes		28,985		—
Foreign government and agency notes		2,048		—
US state and municipal securities		433		—
Total assets	$	125,748	$	3,166
These assets are included in Cash and cash equivalents, Short-term investments, and Long-term investment securities.  See Note 7. Investment Securities.

Liabilities Measured At Fair Value On A Recurring Basis

	Fair value,
	September 27, 2014
(in thousands)	Level 2
Current liabilities:
Forward currency contracts	$	870
	Fair value,
	December 28, 2013
(in thousands)	Level 2
Current liabilities:
Forward currency contracts	$	612
These are included in Accrued liabilities.