Fair Value Measurements and Disclosures (Tables)

3 Months Ended

Mar. 31, 2018

Assets and liabilities measurements at estimated fair value on recurring basis excluding accrued interest components

The following tables present the Company’s assets and liabilities measured at estimated fair value on a recurring basis, excluding accrued interest components, categorized in accordance with the fair value hierarchy (in thousands), as of the following dates:

	March 31, 2018								December 30, 2017
	Fair Value Measurements Using Input Types								Fair Value Measurements Using Input Types
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	9,680	$	—	$	—	$	9,680	$	256	$	—	$	—	$	256
Marketable securities:
U.S. Government agency debt securities		—		1,496		—		1,496		—		1,495		—		1,495
Certificates of deposits		—		6,995		—		6,995		—		14,497		—		14,497
Commercial paper		—		5,474		—		5,474		—		7,949		—		7,949
Corporate debt securities		—		36,842		—		36,842		—		47,968		—		47,968
Asset-backed Securities		—		7,168		—		7,168		—		10,221		—		10,221
Total marketable securities	$	—	$	57,975	$	—	$	57,975	$	—	$	82,130	$	—	$	82,130
Total⁽¹⁾	$	9,680	$	57,975	$	—	$	67,655	$	256	$	82,130	$	—	$	82,386

⁽¹⁾	Excludes $56.2 million and $34.6 million held in operating accounts as of March 31, 2018 and December 30, 2017, respectively. See “Note 4. Cash and Investments” of the Notes to Consolidated Financial Statements for more information.

Notional amounts and fair value of outstanding derivative positions

The following table presents the notional amounts and fair values of the Company’s outstanding derivative instruments in U.S. Dollar equivalent (in millions):

	As of March 31, 2018						As of December 30, 2017
			Fair Value						Fair Value
	Notional Amount		Asset		Liability		Notional Amount		Asset		Liability
Undesignated Hedges:
Forward Foreign Currency Contracts
Purchase	$	29.4	$	—	$	0.1	$	27.5	$	—	$	0.1
Sell	$	19.8	$	—	$	—	$	16.8	$	0.1	$	—