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Cash Equivalents and Investments
 9 Months Ended
Oct. 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 condensed consolidated balance sheets (in thousands):
October 31, 2021
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
Cash equivalents:
Money market funds$581,689 $— $— $581,689 
U.S. government securities60,000 — — 60,000 
Commercial paper46,992 1 — 46,993 
Certificates of deposit27,001 1 — 27,002 
Corporate notes and bonds6,193 1 (1)6,193 
Total cash equivalents721,875 3 (1)721,877 
Investments:
Corporate notes and bonds2,512,863 192 (3,278)2,509,777 
Commercial paper1,066,027 82 (131)1,065,978 
U.S. government and agency securities391,632 25 (321)391,336 
Certificates of deposit200,382 31 (33)200,380 
Total investments4,170,904 330 (3,763)4,167,471 
Total cash equivalents and investments$4,892,779 $333 $(3,764)$4,889,348 
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 

As of October 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 debt securities, by remaining contractual maturity, are as follows (in thousands):
October 31, 2021
Estimated
Fair Value
Due within 1 year$3,095,801 
Due in 1 year to 3 years1,211,858 
Total$4,307,659 
The following table shows the fair values and the gross unrealized losses of these securities, classified by the length of time that the securities have been in a continuous unrealized loss position, and aggregated by investment types, excluding those securities classified within cash and cash equivalents on the condensed consolidated balance sheets (in thousands):
October 31, 2021
Less than 12 Months12 Months or GreaterTotal
Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses
Cash equivalents:
Commercial paper$17,998 $— $— $— $17,998 $— 
Corporate notes and bonds5,058 (1)— — 5,058 (1)
Total cash equivalents23,056 (1)— — 23,056 (1)
Investments:
Corporate notes and bonds2,170,442 (3,278)— — 2,170,442 (3,278)
Commercial paper449,901 (131)— — 449,901 (131)
U.S. government and agency securities230,705 (321)— — 230,705 (321)
Certificates of deposit40,844 (33)— — 40,844 (33)
Total investments2,891,892 (3,763)— — 2,891,892 (3,763)
Total cash equivalents and investments$2,914,948 $(3,764)$— $— $2,914,948 $(3,764)
Gross unrealized losses on the Company’s available-for-sale marketable debt securities were $0.6 million as of January 31, 2021.

For available-for-sale marketable debt securities with unrealized loss positions, the Company does not intend to sell these securities and it is more likely than not that the Company will hold these securities until maturity or a recovery of the cost basis. The decline in fair value of these securities due to credit related factors was not material as of October 31, 2021 or January 31, 2021.

See Note 4 for information regarding the Company’s strategic investments.