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Fair Value Measurements (Tables)
 6 Months Ended
Jul. 31, 2021
Fair Value Disclosures [Abstract]  
Information about Assets that are Measured at Fair Value on a Recurring Basis
The following table presents information about our assets and liabilities that are measured at fair value on a recurring basis and their assigned levels within the valuation hierarchy as of July 31, 2021 (in thousands):
Level 1Level 2Level 3Total
U.S. treasury securities$1,096,812 $— $— $1,096,812 
U.S. agency obligations— 189,254 — 189,254 
Corporate bonds— 372,479 — 372,479 
Commercial paper— 780,888 — 780,888 
Money market funds414,663 — — 414,663 
Marketable equity investments141,006 — — 141,006 
Foreign currency derivative assets— 10,973 — 10,973 
Total assets$1,652,481 $1,353,594 $— $3,006,075 
Foreign currency derivative liabilities$— $34,877 $— $34,877 
Total liabilities$— $34,877 $— $34,877 
The following table presents information about our assets and liabilities that are measured at fair value on a recurring basis and their assigned levels within the valuation hierarchy as of January 31, 2021 (in thousands):
Level 1Level 2Level 3Total
U.S. treasury securities$1,054,341 $— $— $1,054,341 
U.S. agency obligations— 504,445 — 504,445 
Corporate bonds— 347,802 — 347,802 
Commercial paper— 664,262 — 664,262 
Money market funds659,964 — — 659,964 
Marketable equity investments21,300 — — 21,300 
Foreign currency derivative assets— 3,221 — 3,221 
Total assets$1,735,605 $1,519,730 $— $3,255,335 
Foreign currency derivative liabilities$— $49,456 $— $49,456 
Total liabilities$— $49,456 $— $49,456