Fair Value Measurements (Tables)

3 Months Ended

Mar. 28, 2015

Fair Value Measurements [Abstract]

Financial Assets Measured At Fair Value On Recurring Basis

	Fair value,
	March 28, 2015
(in thousands)	Level 1		Level 2
Assets:
Money market funds	$	4,035	$	—
Corporate bonds and notes		90,114		21,607
U.S. treasury and government agency notes		40,553		1,946
Foreign government and agency notes		51		11,130
U.S. state and municipal securities		—		231
Total assets	$	134,753	$	34,914
	Fair value,
	December 27, 2014
(in thousands)	Level 1		Level 2
Assets:
Money market funds	$	8,729	$	—
Corporate bonds and notes		88,401		17,030
U.S. treasury and government agency notes		38,283		1,387
Foreign government and agency notes		537		7,525
U.S. state and municipal securities		—		231
Total assets	$	135,950	$	26,173
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,
	March 28, 2015
(in thousands)	Level 2
Current liabilities:
Forward currency contracts	$	2,241
	Fair value,
	December 27, 2014
(in thousands)	Level 2
Current liabilities:
Forward currency contracts	$	1,907
These are included in Accrued liabilities.