Delivery Costs (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Other Income and Expenses [Abstract]
Shipping and classroom delivery costs	$ 7,897,000	$ 9,295,000	$ 17,154,000	$ 18,406,000