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Cash Equivalents and Investments
 9 Months Ended
Oct. 31, 2022
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, 2022
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
Cash equivalents:
Money market funds$425,221 $— $— $425,221 
Commercial paper89,834 — (27)89,807 
Corporate notes and bonds1,600 — — 1,600 
Total cash equivalents516,655 — (27)516,628 
Investments:
Corporate notes and bonds2,340,262 11 (40,916)2,299,357 
Commercial paper784,220 18 (5,121)779,117 
U.S. government and agency securities598,365 4 (15,722)582,647 
Certificates of deposit408,197 15 (2,373)405,839 
Total investments4,131,044 48 (64,132)4,066,960 
Total cash equivalents and investments$4,647,699 $48 $(64,159)$4,583,588 
January 31, 2022
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
Cash equivalents:
Money market funds$722,492 $— $— $722,492 
Commercial paper77,795 1 (2)77,794 
U.S. government securities36,997 — (2)36,995 
Corporate notes and bonds7,950 — (1)7,949 
Total cash equivalents845,234 1 (5)845,230 
Investments:
Corporate notes and bonds2,610,010 91 (12,062)2,598,039 
Commercial paper884,376 81 (821)883,636 
U.S. government and agency securities439,449 28 (2,558)436,919 
Certificates of deposit104,108 4 (135)103,977 
Total investments4,037,943 204 (15,576)4,022,571 
Total cash equivalents and investments$4,883,177 $205 $(15,581)$4,867,801 

The Company included $17.0 million and $14.1 million of interest receivable in prepaid expenses and other current assets on the condensed consolidated balance sheets as of October 31, 2022 and January 31, 2022, respectively. The Company did not recognize an allowance for credit losses against interest receivable as of October 31, 2022 and January 31, 2022 because such potential losses were not material.

As of October 31, 2022, 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):

October 31, 2022
Estimated
Fair Value
Due within 1 year$3,215,286 
Due in 1 year to 3 years943,081 
Total$4,158,367 
The following tables show the fair values of, and the gross unrealized losses on, the Company’s available-for-sale marketable debt securities, classified by the length of time that the securities have been in a continuous unrealized loss position and aggregated by investment type, on the condensed consolidated balance sheets (in thousands):

October 31, 2022
Less than 12 Months12 Months or GreaterTotal
Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses
Cash equivalents:
Commercial paper$89,807 $(27)$— $— $89,807 $(27)
Total cash equivalents89,807 (27)— — 89,807 (27)
Investments:
Corporate notes and bonds1,541,456 (25,874)710,475 (15,042)2,251,931 (40,916)
Commercial paper738,280 (5,121)— — 738,280 (5,121)
U.S. government and agency securities455,945 (10,440)120,697 (5,282)576,642 (15,722)
Certificates of deposit320,894 (2,368)8,996 (5)329,890 (2,373)
Total investments3,056,575 (43,803)840,168 (20,329)3,896,743 (64,132)
Total cash equivalents and investments$3,146,382 $(43,830)$840,168 $(20,329)$3,986,550 $(64,159)

January 31, 2022
Less than 12 Months12 Months or GreaterTotal
Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses
Cash equivalents:
Commercial paper$55,819 $(2)$— $— $55,819 $(2)
U.S. government securities36,995 (2)— — 36,995 (2)
Corporate notes and bonds7,629 (1)— — 7,629 (1)
Total cash equivalents100,443 (5)— — 100,443 (5)
Investments:
Corporate notes and bonds2,378,956 (12,044)8,935 (18)2,387,891 (12,062)
Commercial paper653,827 (821)— — 653,827 (821)
U.S. government and agency securities334,980 (2,558)— — 334,980 (2,558)
Certificates of deposit49,118 (135)— — 49,118 (135)
Total investments3,416,881 (15,558)8,935 (18)3,425,816 (15,576)
Total cash equivalents and investments$3,517,324 $(15,563)$8,935 $(18)$3,526,259 $(15,581)

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, 2022 and January 31, 2022.

See Note 5 for information regarding the Company’s strategic investments.