Deferred Costs (Details) - USD ($)	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Jan. 31, 2023
Deferred Costs [Abstract]
Deferred costs	$ 23,166,000		$ 31,825,000
Amortization of deferred costs	5,000,000	$ 6,000,000
Impairment losses recorded in relation to the costs capitalized	$ 0	$ 0