Investments and Fair Value Measurements (Tables)

9 Months Ended

Oct. 31, 2020

Investments, Debt and Equity Securities and Fair Value Disclosures [Abstract]

Schedule of fair value of financial assets and liabilities that were measured on a recurring basis

The following table sets forth the fair value of our financial assets that were measured on a recurring basis:

	October 31, 2020								January 31, 2020
(In thousands)	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	799,887	$	—	$	—	$	799,887	$	138,999	$	—	$	—	$	138,999
U.S. treasury securities	—		301,922		—		301,922		—		875,180		—		875,180
Corporate bonds	—		39,487		—		39,487		—		124,972		—		124,972
Commercial paper	—		—		—		—		—		4,994		—		4,994
Other	—		—		2,000		2,000		—		—		2,000		2,000
Reported as:
Assets:
Cash and cash equivalents							$	799,887							$	147,034
Investments, current							341,409								976,508
Investments, non-current							2,000								22,603
Total							$	1,143,296							$	1,146,145

Schedule of available-for-sale securities reconciliation

The following table presents our available-for-sale investments as of October 31, 2020:

(In thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
Investments, current:
U.S. treasury securities	$	301,275	$	647	$	—	$	301,922
Corporate bonds	39,302		185		—		39,487
Total available-for-sale investments	$	340,577	$	832	$	—	$	341,409

The following table presents our available-for-sale investments as of January 31, 2020:

(In thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
Cash and cash equivalents:
U.S. treasury securities	$	8,035	$	—	$	—	$	8,035
Investments, current:
U.S. treasury securities	866,578		590		(23)		867,145
Corporate bonds	103,848		521		—		104,369
Commercial paper	4,991		3		—		4,994
Investments, non-current:
Corporate bonds	20,444		159		—		20,603
Total available-for-sale investments	$	1,003,896	$	1,273	$	(23)	$	1,005,146

Schedule of unrealized loss on investments

The following table presents the fair values and unrealized losses of our available-for-sale investments classified by length of time that the securities have been in a continuous unrealized loss position:

	Less than 12 Months				12 Months or Greater				Total
(In thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
January 31, 2020
U.S. treasury securities	$	129,149	$	(23)	$	—	$	—	$	129,149	$	(23)
Corporate bonds	7,504		—		—		—		7,504		—
Total	$	136,653	$	(23)	$	—	$	—	$	136,653	$	(23)

Investments classified by contractual maturity date

The contractual maturities of our investments are as follows:

(In thousands)	October 31, 2020
Due within one year	$	341,409
Total	$	341,409

Schedule of equity investments

The following table provides a summary of our equity investments:

(In thousands)	October 31, 2020		January 31, 2020
Equity investments without readily determinable fair values	$	12,744	$	10,744
Equity investments under the equity method of accounting	3,484		2,023
Total	$	16,228	$	12,767