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Cash Equivalents and Investments
 12 Months Ended
Jan. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Cash Equivalents and Investments Cash Equivalents and Investments
The following is a summary of the Company’s cash equivalents, short-term investments, and long-term investments on the consolidated balance sheets (in thousands):

January 31, 2021
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
Cash equivalents:
Money market funds$334,891 $— $— $334,891 
Commercial paper242,040 2 (5)242,037 
Corporate notes and bonds58,969 3 (2)58,970 
U.S. government securities23,700 — — 23,700 
Certificates of deposit23,500 3 — 23,503 
Total cash equivalents683,100 8 (7)683,101 
Investments:
Corporate notes and bonds2,287,006 628 (481)2,287,153 
U.S. government and agency securities1,016,059 250 (46)1,016,263 
Commercial paper711,389 85 (102)711,372 
Certificates of deposit238,278 97 (1)238,374 
Total investments4,252,732 1,060 (630)4,253,162 
Total cash equivalents and investments$4,935,832 $1,068 $(637)$4,936,263 
January 31, 2020
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
Cash equivalents:
U.S. government and agency securities$32,470 $2 $— $32,472 
Money market funds 21,379 — — 21,379 
Commercial paper446 — — 446 
Total cash equivalents54,295 2 — 54,297 
Investments:
U.S. government and agency securities259,738 216 (1)259,953 
Corporate notes and bonds30,642 57 — 30,699 
Commercial paper17,006 2 — 17,008 
Certificates of deposit12,592 12 — 12,604 
Asset-backed securities10,104 8 — 10,112 
Total investments330,082 295 (1)330,376 
Total cash equivalents and investments$384,377 $297 $(1)$384,673 

As of January 31, 2021, the contractual maturities of the Company’s available-for-sale marketable debt securities did not exceed 36 months. The estimated fair values of available-for-sale marketable debt securities, by remaining contractual maturity, are as follows (in thousands):
January 31, 2021
Estimated
Fair Value
Due within 1 year$3,436,097 
Due in 1 year to 3 years1,165,275 
Total$4,601,372 

There were no impairments of available-for-sale marketable debt securities considered “other-than-temporary” during each of the fiscal years ended January 31, 2021, 2020, and 2019 as it was more likely than not the Company would hold the securities until maturity or a recovery of the cost basis.

As of each of January 31, 2021 and 2020, the Company had no marketable equity securities on the consolidated balance sheets.