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Marketable Securities - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2024
Jul. 31, 2023
Jul. 31, 2024
Jul. 31, 2023
Schedule of Available-for-sale Securities [Line Items]        
Sales and maturities of marketable securities     $ 204,145 $ 149,921
Other (Loss) Income, Net        
Schedule of Available-for-sale Securities [Line Items]        
Net realized gain (loss) $ 56 $ 7 79 6
Amortization of discounts and premiums, net $ 2,066 $ 894 $ 4,221 $ 1,172