Delivery Costs (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Other Income and Expenses [Abstract]
Shipping and classroom delivery costs	$ 6,209,000	$ 6,014,000	$ 14,242,000	$ 12,999,000