Delivery Costs (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Other Income and Expenses [Abstract]
Shipping and classroom delivery costs	$ 5,112,000	$ 4,907,000	$ 8,033,000	$ 6,985,000