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Cash Equivalents and Investments (Tables)
 6 Months Ended
Jul. 31, 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):

July 31, 2022
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
Cash equivalents:
Money market funds$590,661 $— $— $590,661 
Commercial paper71,835 — (14)71,821 
Corporate notes and bonds15,703 — (7)15,696 
Total cash equivalents678,199 — (21)678,178 
Investments:
Corporate notes and bonds2,464,401 97 (30,226)2,434,272 
Commercial paper893,431 224 (3,852)889,803 
U.S. government and agency securities528,941 304 (9,640)519,605 
Certificates of deposit290,264 59 (842)289,481 
Total investments4,177,037 684 (44,560)4,133,161 
Total cash equivalents and investments$4,855,236 $684 $(44,581)$4,811,339 
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):

July 31, 2022
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
Cash equivalents:
Money market funds$590,661 $— $— $590,661 
Commercial paper71,835 — (14)71,821 
Corporate notes and bonds15,703 — (7)15,696 
Total cash equivalents678,199 — (21)678,178 
Investments:
Corporate notes and bonds2,464,401 97 (30,226)2,434,272 
Commercial paper893,431 224 (3,852)889,803 
U.S. government and agency securities528,941 304 (9,640)519,605 
Certificates of deposit290,264 59 (842)289,481 
Total investments4,177,037 684 (44,560)4,133,161 
Total cash equivalents and investments$4,855,236 $684 $(44,581)$4,811,339 
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):
July 31, 2022
Estimated
Fair Value
Due within 1 year$3,133,994 
Due in 1 year to 3 years1,086,684 
Total$4,220,678 
Schedule of Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value
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):

July 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$61,983 $(14)$— $— $61,983 $(14)
Corporate notes and bonds15,696 (7)— — 15,696 (7)
Total cash equivalents77,679 (21)— — 77,679 (21)
Investments:
Corporate notes and bonds2,285,206 (29,345)62,893 (881)2,348,099 (30,226)
Commercial paper837,383 (3,852)— — 837,383 (3,852)
U.S. government and agency securities369,879 (9,334)13,694 (306)383,573 (9,640)
Certificates of deposit223,543 (842)— — 223,543 (842)
Total investments3,716,011 (43,373)76,587 (1,187)3,792,598 (44,560)
Total cash equivalents and investments$3,793,690 $(43,394)$76,587 $(1,187)$3,870,277 $(44,581)

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)