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Fair Value Measurement (Tables)
 3 Months Ended
Apr. 30, 2022
Fair Value Disclosures [Abstract]  
Schedule of Financial Instruments Measured at Fair Value on Recurring Basis
The following tables present the fair value hierarchy of our financial assets measured at fair value on a recurring basis as of April 30, 2022 and January 31, 2022 (in thousands): 
 As of April 30, 2022
 Level 1Level 2Total
Financial assets:   
Money market$1,050,171 $— $1,050,171 
Total cash equivalents1,050,171 — 1,050,171 
Commercial paper— 15,359 15,359 
Corporate bonds— 93,610 93,610 
Municipal bonds— 13,144 13,144 
Total marketable securities— 122,113 122,113 
Total$1,050,171 $122,113 $1,172,284 
 As of January 31, 2022
 Level 1Level 2Total
Financial assets:   
Money market$1,056,555 $— $1,056,555 
Total cash equivalents1,056,555 — 1,056,555 
Commercial paper— 15,343 15,343 
Corporate bonds— 91,432 91,432 
Municipal bonds— 9,165 9,165 
Total marketable securities— 115,940 115,940 
Total$1,056,555 $115,940 $1,172,495