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Marketable Securities (Tables)
 9 Months Ended
Oct. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Marketable Securities
As of October 31, 2020 and January 31, 2020, our marketable securities consisted of the following: 
As of October 31, 2020
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
(in thousands)
Commercial paper$6,244 $— $— $6,244 
Agency bonds409,695 75 (297)409,473 
Corporate and other debt securities465,399 1,727 (180)466,946 
U.S. government agency securities144,361 19 (26)144,354 
Treasury bills114,409 3 (4)114,408 
Marketable securities$1,140,108 $1,824 $(507)$1,141,425 
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 October 31, 2020 and January 31, 2020:
As of
October 31, 2020January 31, 2020
(in thousands)
Less than one year$602,222 $315,900 
Due in one to five years539,203 256,160 
Total$1,141,425 $572,060