Allowance for Doubtful Accounts (Activity in Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 31, 2020	Jul. 31, 2020
Segment Reporting Information [Line Items]
Beginning balance		$ (710)
Provision for credit losses	$ (800)	(10,505)
Accounts written off as uncollectible		7
Ending balance	(11,208)	(11,208)
Wholesale
Segment Reporting Information [Line Items]
Beginning balance		(628)
Provision for credit losses		(10,557)
Accounts written off as uncollectible		7
Ending balance	(11,178)	(11,178)
Retail
Segment Reporting Information [Line Items]
Beginning balance		(82)
Provision for credit losses		52
Ending balance	$ (30)	$ (30)