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Marketable Securities - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Oct. 31, 2025
Oct. 31, 2024
Schedule of Available-for-sale Securities [Line Items]        
Sales and maturities of marketable securities     $ 382,318 $ 309,178
Other Income        
Schedule of Available-for-sale Securities [Line Items]        
Net realized gain (loss) $ 6 $ 17 279 96
Amortization of discounts and premiums, net $ 868 $ 1,832 $ 3,574 $ 6,053