Financial Instruments (Tables)

12 Months Ended

Feb. 02, 2020

Fair Value, Assets Measured on Recurring Basis

The following tables summarize our cash equivalents, marketable securities and restricted cash by significant investment categories at the end of fiscal 2019 and 2020 (in thousands):


	At the End of Fiscal 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Cash Equivalents		Marketable Securities		Restricted Cash
Level 1

Money market accounts	$	—	$	—	$	—	$	43,038	$	27,215	$	—	$	15,823
Level 2
U.S. government treasury notes	315,329		208		(315)		315,222		34,129		281,093		—
U.S. government agencies	69,114		17		(154)		68,977		9,983		58,994		—
Corporate debt securities	363,860		534		(757)		363,637		—		363,637		—
Foreign government bonds	7,965		36		—		8,001		—		8,001		—
Asset-backed securities	37,664		105		(12)		37,757		—		37,757		—
Total	$	793,932	$	900	$	(1,238)	$	836,632	$	71,327	$	749,482	$	15,823


	At the End of Fiscal 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Cash Equivalents		Marketable Securities		Restricted Cash
Level 1

Money market accounts	$	—	$	—	$	—	$	26,355	$	11,068	$	—	$	15,287
Level 2
U.S. government treasury notes	323,751		2,146		—		325,897		—		325,897		—
U.S. government agencies	53,930		317		(3)		54,244		—		54,244		—
Corporate debt securities	452,318		3,954		(1)		456,271		3,001		453,270		—
Foreign government bonds	14,994		147		—		15,141		—		15,141		—
Asset-backed securities	87,267		699		—		87,966		—		87,966		—
Total	$	932,260	$	7,263	$	(4)	$	965,874	$	14,069	$	936,518	$	15,287

Investments Classified by Contractual Maturity Date

The amortized cost and estimated fair value of our marketable securities are shown below by contractual maturity (in thousands):


	At the End of Fiscal 2020
	Amortized Cost		Fair Value
Due within one year	$	418,950	$	420,769
Due in one to five years	504,689		510,079
Due in five years to ten years	5,620		5,670
Total	$	929,259	$	936,518

Schedule of Unrealized Loss on Investments

The following table presents gross unrealized losses and fair values for those investments that were in a continuous unrealized loss position at the end of fiscal 2019 and 2020, aggregated by investment category (in thousands):


	At the End of Fiscal 2019
	Less than 12 months						Greater than 12 months						Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U.S. government treasury notes	$	156,529	$	(98)	$	40,413	$	(217)	$	196,942	$	(315)
U.S. government agencies	24,892		(20)		23,600		(134)		48,492		(154)
Corporate debt securities	83,577		(152)		96,914		(605)		180,491		(757)

Asset-backed securities	11,194		(12)		—		—		11,194		(12)
Total	$	276,192	$	(282)	$	160,927	$	(956)	$	437,119	$	(1,238)


	At the End of Fiscal 2020
	Less than 12 months						Greater than 12 months						Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U.S. government treasury notes	$	—	$	—	$	1,000	$	—	$	1,000	$	—
U.S. government agencies	4,998		(3)		—		—		4,998		(3)
Corporate debt securities	9,691		(1)		—		—		9,691		(1)


Total	$	14,689	$	(4)	$	1,000	$	—	$	15,689	$	(4)