v3.20.4
Marketable Securities (Tables)
 12 Months Ended
Jan. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Summary of Marketable Securities
As of January 31, 2021 and 2020, our marketable securities consisted of the following: 
As of January 31, 2021
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
(in thousands)
Commercial paper$26,222 $— $— $26,222 
Agency bonds461,335 79 (49)461,365 
Corporate and other debt securities465,207 1,113 (64)466,256 
U.S. government agency securities834,894 28 (257)834,665 
Treasury bills215,902 6 (6)215,902 
Marketable securities$2,003,560 $1,226 $(376)$2,004,410 

As of January 31, 2020
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
(in thousands)
Commercial paper$37,894 $— $— $37,894 
Agency bonds141,157 49 (43)141,163 
Corporate and other debt securities320,407 775 (16)321,166 
U.S. government agency securities71,794 45 (2)71,837 
Marketable securities$571,252 $869 $(61)$572,060 
Summary of Contractual Maturities of Marketable Securities
The following table presents the contractual maturities of our marketable securities as of January 31, 2021 and 2020:
As of January 31,
20212020
(in thousands)
Less than one year$1,017,048 $315,900 
Due in one to five years987,362 256,160 
Total$2,004,410 $572,060