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Financial Instruments and Fair Value - Schedule of Cash Equivalents and Marketable Debt Securities (Detail) - USD ($)
$ in Thousands
Jan. 31, 2022
Jan. 31, 2021
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable debt securities $ 20 $ 214,802
Included in cash equivalents [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable debt securities 20 15,368
Included in marketable debt securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable debt securities $ 0 $ 199,434