Short-Term Investments (Tables)

6 Months Ended

Jul. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Schedule of Short-Term Investments

At July 31, 2022, short-term investments consisted of the following (in thousands):

	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Available-for-sale securities:
Certificates of deposits	$	70,710	$	3	$	(214)	$	70,499
Asset-backed securities	328,546		147		(4,089)		324,604
Commercial paper	173,905		1		(636)		173,270
Corporate notes and bonds	889,583		266		(16,450)		873,399
Foreign government bonds	22,832		12		(409)		22,435
U.S. agency obligations	27,986		7		(625)		27,368
U.S. treasury securities	291,750		110		(4,574)		287,286
Total available-for-sale securities	$	1,805,312	$	546	$	(26,997)	$	1,778,861

At January 31, 2022, short-term investments consisted of the following (in thousands):

	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Available-for-sale securities:
Certificates of deposits	$	13,500	$	—	$	(15)	$	13,485
Asset-backed securities	191,676		45		(1,432)		190,289
Commercial paper	29,432		—		(2)		29,430
Corporate notes and bonds	669,489		276		(5,856)		663,909
Foreign government bonds	24,577		13		(179)		24,411
U.S. agency obligations	27,978		12		(254)		27,736
U.S. treasury securities	290,513		46		(1,755)		288,804
Total available-for-sale securities	$	1,247,165	$	392	$	(9,493)	$	1,238,064

Summary of Estimated Fair Value of Short-Term Investments, Designated as Available-for-Sale and Classified by Contractual Maturity

The following table summarizes the estimated fair value of our short-term investments, designated as available-for-sale and classified by the contractual maturity date of the securities as of the dates shown (in thousands):

	July 31, 2022		January 31, 2022
Due in one year or less	$	862,430	$	457,948
Due in greater than one year	916,431		780,116
Total	$	1,778,861	$	1,238,064

Schedule of Fair Values and Gross Unrealized Loss Position of Available-for-Sale Securities Aggregated by Investment Category

The following table shows the fair values of available-for-sale securities which were in an unrealized loss position, aggregated by investment category, as of July 31, 2022 (in thousands):

	Held for less than 12 months				Held for more than 12 months
	Fair value		Gross unrealized losses		Fair value		Gross unrealized losses
Certificates of deposits	$	60,495	$	(214)	$	—	$	—
Asset-backed securities	282,437		(3,928)		6,188		(161)
Commercial paper	168,390		(636)		—		—
Corporate notes and bonds	766,929		(14,251)		64,854		(2,199)
Foreign government bonds	16,730		(409)		—		—
U.S. agency obligations	22,286		(620)		2,075		(5)
U.S. treasury securities	265,627		(4,330)		7,249		(244)

The following table shows the fair values of available-for-sale securities which were in an unrealized loss position, aggregated by investment category, as of January 31, 2022 (in thousands):

	Held for less than 12 months
	Fair value		Gross unrealized losses
Certificates of deposits	$	5,985	$	(15)
Asset-backed securities	177,056		(1,432)
Commercial paper	17,190		(2)
Corporate notes and bonds	571,099		(5,856)
Foreign government bonds	19,594		(179)
U.S. agency obligations	24,725		(254)
U.S. treasury securities	247,509		(1,756)