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Investments (Tables)
 6 Months Ended
Jul. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Summary of Marketable Securities
As of July 31, 2021 and January 31, 2021, our marketable securities consisted of the following: 
As of July 31, 2021
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
(in thousands)
Commercial paper$33,729 $— $— $33,729 
Agency bonds491,968 82 (53)491,997 
Corporate and other debt securities380,373 314 (89)380,598 
U.S. government agency securities2,213,814 157 (259)2,213,712 
Treasury bills53,996 1 (4)53,993 
Marketable securities$3,173,880 $554 $(405)$3,174,029 
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 July 31, 2021 and January 31, 2021:
As of
July 31, 2021January 31, 2021
(in thousands)
Less than one year$1,660,900 $1,017,048 
Due in one to five years1,513,129 987,362 
Total$3,174,029 $2,004,410 
Summary of Strategic Investments
Strategic investments by form and measurement category as of July 31, 2021 were as follows:
Measurement Category
Fair ValueMeasurement AlternativeTotal
(in thousands)
Equity securities$107,076 $15,288 $122,364 
Debt securities15,431 — 15,431 
Strategic investments$122,507 $15,288 $137,795 
Strategic investments by form and measurement category as of January 31, 2021 were as follows:
Measurement Category
Fair ValueMeasurement AlternativeTotal
(in thousands)
Equity securities$— $13,538 $13,538 
Debt securities5,130 — 5,130 
Strategic investments$5,130 $13,538 $18,668