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Marketable Securities (Tables)
 3 Months Ended
Apr. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Summary of Marketable Securities
As of April 30, 2021 and January 31, 2021, our marketable securities consisted of the following: 
As of April 30, 2021
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
(in thousands)
Commercial paper$57,707 $— $— $57,707 
Agency bonds515,261 44 (148)515,157 
Corporate and other debt securities469,972 563 (107)470,428 
U.S. government agency securities1,876,688 124 (292)1,876,520 
Treasury bills212,484 13 — 212,497 
Marketable securities$3,132,112 $744 $(547)$3,132,309 
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 
Summary of Contractual Maturities of Marketable Securities
The following table presents the contractual maturities of our marketable securities as of April 30, 2021 and January 31, 2021:
As of
April 30, 2021January 31, 2021
(in thousands)
Less than one year$1,597,693 $1,017,048 
Due in one to five years1,534,616 987,362 
Total$3,132,309 $2,004,410