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Cash Equivalents and Investments
 6 Months Ended
Jul. 31, 2021
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):
July 31, 2021
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
Cash equivalents:
Money market funds$317,484 $— $— $317,484 
Commercial paper127,682 1 (1)127,682 
U.S. government securities32,200 — — 32,200 
Certificates of deposit16,000 — — 16,000 
Corporate notes and bonds11,124 — (1)11,123 
Total cash equivalents504,490 1 (2)504,489 
Investments:
Corporate notes and bonds2,384,168 870 (374)2,384,664 
Commercial paper1,254,943 202 (28)1,255,117 
U.S. government and agency securities549,850 123 (23)549,950 
Certificates of deposit203,156 65 — 203,221 
Total investments4,392,117 1,260 (425)4,392,952 
Total cash equivalents and investments$4,896,607 $1,261 $(427)$4,897,441 

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 

As of July 31, 2021, 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 debt securities, by remaining contractual maturity, are as follows (in thousands):
July 31, 2021
Estimated
Fair Value
Due within 1 year$3,623,946 
Due in 1 year to 3 years956,011 
Total$4,579,957 
The Company had no marketable equity securities for any periods presented.