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Cash Equivalents and Investments (Tables)
 3 Months Ended
Apr. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of 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 
Schedule of 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 
Schedule of Available For Sale Securities Remaining Contractual Maturity 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 
Schedule of Unrealized Loss on Investments
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)