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CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS
 3 Months Ended
Apr. 30, 2020
Cash, Cash Equivalents, and Short-term Investments [Abstract]  
Cash, Cash Equivalents and Short-term Investments CASH, CASH EQUIVALENTS, AND SHORT-TERM INVESTMENTS
The following tables summarize our cash, cash equivalents, and short-term investments as of April 30, 2020 and January 31, 2020:
April 30, 2020
(in thousands) Cost BasisGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Cash and cash equivalents:
Cash and bank time deposits$411,926  $—  $—  $411,926  
Money market funds144,745  —  —  144,745  
Total cash and cash equivalents$556,671  $—  $—  $556,671  
Short-term investments:
Bank time deposits$19,741  $—  $—  $19,741  
Total short-term investments$19,741  $—  $—  $19,741  

January 31, 2020
(in thousands)Cost BasisGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Cash and cash equivalents:
Cash and bank time deposits$379,057  $—  $—  $379,057  
Money market funds89  —  —  89  
Total cash and cash equivalents$379,146  $—  $—  $379,146  
Short-term investments:
Bank time deposits$20,215  $—  $—  $20,215  
Total short-term investments$20,215  $—  $—  $20,215  

Bank time deposits which are reported within short-term investments consist of deposits held outside of the U.S. with maturities of greater than 90 days, or without specified maturity dates which we intend to hold for periods in excess of 90 days. All other bank deposits are included within cash and cash equivalents.
During the three months ended April 30, 2020 and 2019, proceeds from maturities and sales of short-term investments were $15.6 million and $3.0 million, respectively.