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Cash Equivalents and Investments (Tables)
 9 Months Ended
Oct. 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):

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 
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):

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 
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):
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 
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):

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)