Investments (Tables)

9 Months Ended

Dec. 31, 2017

Investments, Debt and Equity Securities [Abstract]

The amortized cost and fair value of available-for-sale investments as of December 31, 2017 were as follows:



(in thousands)	Cost			Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government treasuries and agencies securities	$	72,038		$	1	$	(721	)	$	71,318
Money market funds	60,818			—		—			60,818
Asset-backed securities	15,445			—		(50		)	15,395
Corporate bonds	139,775			56		(761		)	139,070
International government bonds	6,524			6		(20		)	6,510
Corporate commercial paper	10,139			—		—			10,139
Bank deposits	34,133			—		—			34,133
Repurchase agreements	97			—		—			97
Total available-for-sale investments	338,969			63		(1,552		)	337,480
Less amounts classified as cash equivalents	(73,414		)	—		—			(73,414		)
Short-term investments	$	265,555		$	63	$	(1,552	)	$	264,066

The amortized cost and fair value of available-for-sale investments as of April 2, 2017 were as follows:



(in thousands)	Cost			Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government treasuries and agencies securities	$	62,048		$	16	$	(508	)	$	61,556
Money market funds	140,425			—		—			140,425
Asset-backed securities	13,865			5		(23		)	13,847
Corporate bonds	96,660			42		(326		)	96,376
International government bonds	5,423			2		(15		)	5,410
Corporate commercial paper	4,898			—		—			4,898
Bank deposits	12,305			—		—			12,305
Repurchase agreements	173			—		—			173
Total available-for-sale investments	335,797			65		(872		)	334,990
Less amounts classified as cash equivalents	(143,498		)	—		—			(143,498		)
Short-term investments	$	192,299		$	65	$	(872	)	$	191,492

Contractual maturity of available-for-sale debt securities

The cost and estimated fair value of available-for-sale securities as of December 31, 2017, by contractual maturity, were as follows:



(in thousands)	Amortized Cost		Estimated Fair Value
Due in 1 year or less	$	132,920	$	132,878
Due in 1-2 years	102,654		101,798
Due in 2-5 years	103,395		102,804
Total investments in available-for-sale securities	$	338,969	$	337,480

Gross unrealized losses and fair value of investments in continuous loss position

The following table shows the gross unrealized losses and fair value of the Company’s investments with unrealized losses as of December 31, 2017, aggregated by investment category and length of time that individual securities have been in a continuous loss position.



	Less Than 12 Months					12 Months or Greater					Total
(in thousands)	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate bonds	$	98,494	$	(529	)	$	25,038	$	(240	)	$	123,532	$	(769	)
Asset-backed securities	14,503		(42		)	892		(8		)	15,395		(50		)
U.S. government treasuries and agencies securities	24,443		(113		)	37,884		(607		)	62,327		(720		)
International government bonds	—		—			2,636		(13		)	2,636		(13		)
Total	$	137,440	$	(684	)	$	66,450	$	(868	)	$	203,890	$	(1,552	)

The following table shows the gross unrealized losses and fair value of the Company’s investments with unrealized losses, as of April 2, 2017, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position.



	Less Than 12 Months					12 Months or Greater				Total
(in thousands)	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Corporate bonds	$	71,308	$	(326	)	$	—	$	—	$	71,308	$	(326	)
Asset-backed securities	11,294		(23		)	—		—		11,294		(23		)
U.S. government treasuries and agencies securities	55,497		(508		)	—		—		55,497		(508		)
International government bonds	2,634		(15		)	—		—		2,634		(15		)
Total	$	140,733	$	(872	)	$	—	$	—	$	140,733	$	(872	)