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Financial Instruments and Fair Value - Schedule of Available-for-Sale Securities Unrealized Loss Position at Fair Value (Detail) - USD ($)
$ in Thousands
Oct. 31, 2025
Jan. 31, 2025
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 Months, Fair Value $ 13,201 $ 51,632
12 Months or Greater, Fair Value 4,105 11,296
Total, Fair Value 17,306 62,928
Less than 12 Months, Unrealized Losses (13) (336)
12 Months or Greater, Unrealized Losses (7) (36)
Total, Unrealized Losses (20) (372)
Corporate bonds [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 Months, Fair Value 2,812 23,200
12 Months or Greater, Fair Value 0 2,144
Total, Fair Value 2,812 25,344
Less than 12 Months, Unrealized Losses (3) (116)
12 Months or Greater, Unrealized Losses 0 (7)
Total, Unrealized Losses (3) (123)
Asset-backed securities [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 Months, Fair Value 4,236 8,052
12 Months or Greater, Fair Value 903 4,343
Total, Fair Value 5,139 12,395
Less than 12 Months, Unrealized Losses (5) (51)
12 Months or Greater, Unrealized Losses (1) (16)
Total, Unrealized Losses (6) (67)
U.S. government securities [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 Months, Fair Value 6,153 20,380
12 Months or Greater, Fair Value 3,202 4,809
Total, Fair Value 9,355 25,189
Less than 12 Months, Unrealized Losses (5) (169)
12 Months or Greater, Unrealized Losses (6) (13)
Total, Unrealized Losses $ (11) $ (182)