Fair Value Measurements (Tables)

12 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Hierarchy for Financial Assets Measured at Fair Value on Recurring Basis

Financial Assets Measured at Fair Value

The Company’s fair value hierarchy for its financial assets measured at fair value on a recurring basis as of March 31, 2018 and April 1, 2017 was as follows (in thousands):

March 31, 2018	Level 1		Level 2			Level 3		Total
Cash equivalents:
Money market securities	$	41,752	$	—		$	—	$	41,752
U.S. treasury fund	2,500		—			—		2,500
Commercial paper	—		3,498			—		3,498
Corporate bonds	—		1,999			—		1,999
Total cash equivalents	$	44,252	$	5,497		$	—	$	49,749
Short term investments - available for sale:
U.S. treasury fund	$	10,458	$	—		$	—	$	10,458
Commercial paper	—		25,913			—		25,913
Corporate bonds	—		10,750			—		10,750
Total short-term investments - available for sale	$	10,458	$	36,663		$	—	$	47,121
Forward purchase or sale contracts:
Japanese Yen	$	—	$	(23	)	$	—	$	(23	)
New Taiwan Dollar	—		3			—		3
Korean Won	—		(12		)	—		(12		)
Euro	—		7			—		7
British Pound	—		49			—		49
Chinese Renminbi	—		(29		)	—		(29		)
Singapore Dollar	—		(1		)	—		(1		)
Total forward contracts	$	—	$	(6	)	$	—	$	(6	)
Deferred compensation plan assets:*
Mutual funds and exchange traded funds	$	1,841	$	—		$	—	$	1,841
Money market securities	207		—			—		207
Total deferred compensation plan assets	$	2,048	$	—		$	—	$	2,048

*These investments represent assets held in trust for ESI's deferred compensation plan

April 1, 2017	Level 1		Level 2			Level 3		Total
Cash equivalents:
Money market securities	$	22,395	$	—		$	—	$	22,395
Commercial paper	—		4,945			—		4,945
Total cash equivalents	$	22,395	$	4,945		$	—	$	27,340
Short term investments - available for sale:
Commercial paper	$	—	$	5,743		$	—	$	5,743
Total short-term investments - available for sale	$	—	$	5,743		$	—	$	5,743
Forward purchase or sale contracts:
Japanese Yen	$	—	$	9		$	—	$	9
New Taiwan Dollar	—		20			—		20
Korean Won	—		39			—		39
Euro	—		(96		)	—		(96		)
Chinese Renminbi	—		(5		)	—		(5		)
Singapore Dollar	—		(1		)	—		(1		)
Total forward contracts	$	—	$	(18	)	$	—	$	(18	)
Deferred compensation plan assets:*
Mutual funds and exchange traded funds	$	845	$	—		$	—	$	845
Money market securities	2,213		—			—		2,213
Total deferred compensation plan assets	$	3,058	$	—		$	—	$	3,058

*These investments represent assets held in trust for ESI's deferred compensation plan

Investments

March 31, 2018 and April 1, 2017 were as follows (in thousands):

			Unrealized
March 31, 2018	Cost		Gain		Loss			Fair Value
Available-for-sale securities (current):
U.S. treasury fund	$	12,975	$	—	$	(17	)	$	12,958
Commercial paper	29,411		—		—			29,411
Corporate bonds	12,768		—		(19		)	12,749
Total investments (current)	$	55,154	$	—	$	(36	)	$	55,118
Available-for-sale securities (non-current):
Mutual funds, exchange traded funds and money market securities*	$	1,881	$	167	$	—		$	2,048
Total investments (non-current)	$	1,881	$	167	$	—		$	2,048
			Unrealized
April 1, 2017	Cost		Gain		Loss			Fair Value
Available-for-sale securities (current):
Commercial paper	$	10,688	$	—	$	—		$	10,688
Total investments (current)	$	10,688	$	—	$	—		$	10,688
Available-for-sale securities (non-current):
Mutual funds, exchange traded funds and money market securities*	$	2,974	$	84	$	—		$	3,058
Total investments (non-current)	$	2,974	$	84	$	—		$	3,058