Deferred Costs (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022	Jan. 31, 2023
Deferred Costs [Abstract]
Deferred costs	$ 19,733,000		$ 19,733,000		$ 31,825,000
Amortization of deferred costs	4,000,000	$ 5,000,000	13,000,000	$ 17,000,000
Impairment losses recorded in relation to the costs capitalized	$ 0	$ 0	$ 0	$ 0