XML 39 R32.htm IDEA: XBRL DOCUMENT v3.25.2
Marketable Securities - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2025
Jul. 31, 2024
Jul. 31, 2025
Jul. 31, 2024
Schedule of Available-for-sale Securities [Line Items]        
Sales and maturities of marketable securities     $ 295,861 $ 204,145
Other Income        
Schedule of Available-for-sale Securities [Line Items]        
Net realized gain (loss) $ 7 $ 56 273 79
Amortization of discounts and premiums, net $ 1,163 $ 2,066 $ 2,706 $ 4,221