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Marketable Securities - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Oct. 31, 2024
Oct. 31, 2023
Schedule of Available-for-sale Securities [Line Items]        
Sales and maturities of marketable securities     $ 309,178 $ 242,847
Other (Loss) Income, Net        
Schedule of Available-for-sale Securities [Line Items]        
Net realized gain (loss) $ (17) $ 2 (96) (4)
Amortization of discounts and premiums, net $ 1,832 $ 1,406 $ 6,053 $ 2,578