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Marketable Securities (Tables)
 3 Months Ended
Apr. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Marketable Securities
As of April 30, 2020 and January 31, 2020, our marketable securities consisted of the following: 
April 30, 2020
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
(in thousands)
Commercial paper$11,892  $—  $—  $11,892  
Agency bonds157,493  285  (56) 157,722  
Corporate and other debt securities392,575  1,780  (344) 394,011  
U.S. government agency securities49,871  218  —  50,089  
Treasury bills2,996  4  —  3,000  
Marketable securities$614,827  $2,287  $(400) $616,714  

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 April 30, 2020 and January 31, 2020:
As of
April 30, 2020January 31, 2020
(in thousands)
Less than one year$326,287  $315,900  
Due in one to five years290,427  256,160  
Total$616,714  $572,060