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Fair Value Measurements
9 Months Ended
Oct. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following table presents the fair value hierarchy for the Company’s assets measured at fair value on a recurring basis as of October 31, 2020 (in thousands):
Level 1
Level 2
Total
Cash equivalents:
U.S. government and agency securities$— $3,778,212 $3,778,212 
Money market funds54,422 — 54,422 
Short-term investments:
U.S. government and agency securities— 681,018 681,018 
Corporate notes and bonds— 66,946 66,946 
Certificates of deposit— 45,312 45,312 
Commercial paper— 20,847 20,847 
Long-term investments:
U.S. government and agency securities— 301,978 301,978 
Corporate notes and bonds— 45,178 45,178 
Asset-backed securities— 247 247 
Total
$54,422 $4,939,738 $4,994,160 

The following table presents the fair value hierarchy for the Company’s assets measured at fair value on a recurring basis as of January 31, 2020 (in thousands):
Level 1
Level 2
Total
Cash equivalents:
U.S. government and agency securities
$— $32,472 $32,472 
Money market funds
21,379 — 21,379 
Commercial paper
— 446 446 
Short-term investments:
U.S. government securities
— 245,756 245,756 
Corporate notes and bonds
— 23,674 23,674 
Commercial paper
— 17,008 17,008 
Certificates of deposit
— 10,899 10,899 
Asset-backed securities
— 9,507 9,507 
Long-term investments:
U.S. government and agency securities
— 14,197 14,197 
Corporate notes and bonds
— 7,025 7,025 
Certificates of deposit
— 1,705 1,705 
Asset-backed securities
— 605 605 
Total
$21,379 $363,294 $384,673 
The Company determines the fair value of its security holdings based on pricing from the Company’s service providers and market prices from industry-standard independent data providers. Such market prices may be quoted prices in active markets for identical assets (Level 1 inputs) or pricing determined using inputs other than quoted prices that are observable either directly or indirectly (Level 2 inputs), such as yield curve, volatility factors, credit spreads, default rates, loss severity, current market and contractual prices for the underlying instruments or debt, broker and dealer quotes, as well as other relevant economic measures.