Allowance for Doubtful Accounts (Activity in Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Oct. 31, 2020	Oct. 31, 2020
Segment Reporting Information [Line Items]
Beginning balance		$ (710)
Provision for credit losses	$ (4,300)	(14,874)
Accounts written off as uncollectible		110
Ending balance	(15,474)	(15,474)
Wholesale
Segment Reporting Information [Line Items]
Beginning balance		(628)
Provision for credit losses		(14,919)
Accounts written off as uncollectible		110
Ending balance	(15,437)	(15,437)
Retail [Member]
Segment Reporting Information [Line Items]
Beginning balance		(82)
Provision for credit losses		45
Ending balance	$ (37)	$ (37)