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Cash Equivalents and Investments (Tables)
 12 Months Ended
Jan. 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 consolidated balance sheets (in thousands):

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 

January 31, 2021
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
Cash equivalents:
Money market funds$334,891 $— $— $334,891 
Commercial paper242,040 2 (5)242,037 
Corporate notes and bonds58,969 3 (2)58,970 
U.S. government securities23,700 — — 23,700 
Certificates of deposit23,500 3 — 23,503 
Total cash equivalents683,100 8 (7)683,101 
Investments:
Corporate notes and bonds2,287,006 628 (481)2,287,153 
U.S. government and agency securities1,016,059 250 (46)1,016,263 
Commercial paper711,389 85 (102)711,372 
Certificates of deposit238,278 97 (1)238,374 
Total investments4,252,732 1,060 (630)4,253,162 
Total cash equivalents and investments$4,935,832 $1,068 $(637)$4,936,263 
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 consolidated balance sheets (in thousands):

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 

January 31, 2021
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
Cash equivalents:
Money market funds$334,891 $— $— $334,891 
Commercial paper242,040 2 (5)242,037 
Corporate notes and bonds58,969 3 (2)58,970 
U.S. government securities23,700 — — 23,700 
Certificates of deposit23,500 3 — 23,503 
Total cash equivalents683,100 8 (7)683,101 
Investments:
Corporate notes and bonds2,287,006 628 (481)2,287,153 
U.S. government and agency securities1,016,059 250 (46)1,016,263 
Commercial paper711,389 85 (102)711,372 
Certificates of deposit238,278 97 (1)238,374 
Total investments4,252,732 1,060 (630)4,253,162 
Total cash equivalents and investments$4,935,832 $1,068 $(637)$4,936,263 
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):
January 31, 2022
Estimated
Fair Value
Due within 1 year$2,889,102 
Due in 1 year to 3 years1,256,207 
Total$4,145,309 
Schedule of Unrealized Loss on Investments
The following table shows 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 types, on the consolidated balance sheet as of January 31, 2022 (in thousands):

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)