Financial Instruments and Fair Value - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2024	Jul. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Interest income and realized gains and losses from financial instruments	$ 2,100,000	$ 1,900,000	$ 4,400,000	$ 3,200,000
Carrying value of fixed deposit accounts	153,925,000	122,515,000	153,925,000	122,515,000	$ 144,914,000	$ 113,541,000
Impairment losses on investment	0	$ 1,200,000	0	$ 1,200,000
Non-marketable equity investment	1,200,000		1,200,000		1,200,000
Fixed Deposit Accounts [Member] | Level 1 [Member]
Debt Securities, Available-for-Sale [Line Items]
Carrying value of fixed deposit accounts	$ 9,600,000		$ 9,600,000		$ 7,000,000