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Marketable Securities - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Schedule of Available-for-sale Securities [Line Items]    
Sales and maturities of marketable securities $ 203,416 $ 91,081
Other Income    
Schedule of Available-for-sale Securities [Line Items]    
Net realized gain (loss) 266 23
Amortization of discounts and premiums, net $ 1,543 $ 2,155