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Cash Equivalents and Investments
 3 Months Ended
Apr. 30, 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):

April 30, 2022
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
Cash equivalents:
Money market funds$744,931 $— $— $744,931 
Commercial paper98,852 1 (14)98,839 
Corporate notes and bonds13,545 — (2)13,543 
Total cash equivalents857,328 1 (16)857,313 
Investments:
Corporate notes and bonds2,481,897 23 (31,188)2,450,732 
Commercial paper776,878 — (3,255)773,623 
U.S. government and agency securities597,500 125 (8,990)588,635 
Certificates of deposit151,467 42 (442)151,067 
Total investments4,007,742 190 (43,875)3,964,057 
Total cash equivalents and investments$4,865,070 $191 $(43,891)$4,821,370 

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 $14.3 million and $14.1 million of interest receivable in prepaid expenses and other current assets on the condensed consolidated balance sheets as of April 30, 2022 and January 31, 2022, respectively. The Company did not recognize an allowance for credit losses against interest receivable as of April 30, 2022 and January 31, 2022 because such potential losses were not material.
As of April 30, 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):

April 30, 2022
Estimated
Fair Value
Due within 1 year$2,864,061 
Due in 1 year to 3 years1,212,378 
Total$4,076,439 

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):

April 30, 2022
Less than 12 Months12 Months or GreaterTotal
Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses
Cash equivalents:
Commercial paper$91,794 $(14)$— $— $91,794 $(14)
Corporate notes and bonds13,343 (2)— — 13,343 (2)
Total cash equivalents105,137 (16)— — 105,137 (16)
Investments:
Corporate notes and bonds2,366,492 (30,842)25,832 (346)2,392,324 (31,188)
Commercial paper773,377 (3,255)— — 773,377 (3,255)
U.S. government and agency securities452,886 (8,688)13,698 (302)466,584 (8,990)
Certificates of deposit108,223 (442)— — 108,223 (442)
Total investments3,700,978 (43,227)39,530 (648)3,740,508 (43,875)
Total cash equivalents and investments$3,806,115 $(43,243)$39,530 $(648)$3,845,645 $(43,891)
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 April 30, 2022 and January 31, 2022.

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