Fair Value Measurements (Tables)

12 Months Ended

Jan. 31, 2020

Fair Value Disclosures [Abstract]

Summary of Financial Assets Measured on Recurring Basis

The following table summarizes our financial assets that are measured at fair value on a recurring basis:

	January 31, 2020
(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Level 1:
Cash equivalents(1)
Money market funds	$	165,424	$	—	$	—	$	165,424
Level 2:
Available-for-sale securities
Commercial paper	14,919		7		(1)		14,925
Corporate notes and bonds	372,844		891		(31)		373,704
U.S. Treasury securities	90,697		153		(1)		90,849
U.S. government agency securities	175,086		153		(49)		175,190
Level 2 total	653,546		1,204		(82)		654,668
Total	$	818,970	$	1,204	$	(82)	$	820,092
	January 31, 2019
(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Level 1:
Cash equivalents(1)
Money market funds	$	350,063	$	—	$	—	$	350,063
Level 2:
Cash equivalents(1)
Commercial paper	76,828		—		(11)		76,817
Corporate notes and bonds	2,998		—		—		2,998
U.S. government agency securities	6,491		—		—		6,491
Available-for-sale securities
Commercial paper	86,655		4		(21)		86,638
Corporate notes and bonds	287,496		389		(105)		287,780
U.S. Treasury securities	4,982		—		(1)		4,981
U.S. government agency securities	36,021		7		(4)		36,024
Level 2 total	501,471		400		(142)		501,729
Total	$	851,534	$	400	$	(142)	$	851,792

(1)Included in "cash and cash equivalents" in our consolidated balance sheets as of January 31, 2020 and 2019, in addition to cash of $75.8 million and $81.4 million

Available-for-Sale Marketable Securities

The fair value of our available-for-sale securities as of January 31, 2020, by remaining contractual maturities, were as follows (in thousands):

Due in one year or less	$	414,939
Due in one to two years	239,729
	$	654,668