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Available-for-sale securities - Summary of Maturities of Available-for-sale Securities (Details) - USD ($)
$ in Thousands
May 02, 2021
Jan. 31, 2021
Fair Value    
Within 1 year $ 10,591  
After 1 year through 5 years 1,012  
Total available-for-sale securities 11,603 $ 11,989
Amortized Cost    
Within 1 year 11,041  
After 1 year through 5 years 1,875  
Total available-for-sale securities $ 12,916 $ 13,244