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Marketable Securities
 3 Months Ended
Apr. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities 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 
We review the individual securities that have unrealized losses on a regular basis to evaluate whether or not any security has experienced, or is expected to experience, credit losses resulting in the decline in fair value. We evaluate, among other factors, whether we have the intention to sell any of these marketable securities and whether it is more likely than not that we will be required to sell any of them before recovery of the amortized cost basis. We have not recorded an allowance for credit losses, as we believe any such losses would be immaterial based on the high-grade credit rating for each of our marketable securities as of the end of each period. There were no material realized gains or losses from available-for-sale securities that were reclassified out of accumulated other comprehensive income for the three months ended April 30, 2021 and 2020.
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