Allowance for Doubtful Accounts (Activity in Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jan. 31, 2021
Segment Reporting Information [Line Items]
Beginning balance	$ (17,459)	$ (710)	$ (710)
Provision for credit losses	(54)	(10,505)	(16,882)
Accounts written off as uncollectible	71		133
Ending balance	(17,442)	(11,208)	(17,459)
Wholesale
Segment Reporting Information [Line Items]
Beginning balance	(17,429)	(628)	(628)
Provision for credit losses	(28)	(10,557)	(16,934)
Accounts written off as uncollectible	71		133
Ending balance	(17,386)	(11,178)	(17,429)
Retail [Member]
Segment Reporting Information [Line Items]
Beginning balance	(30)	(82)	(82)
Provision for credit losses	(26)	52	52
Ending balance	$ (56)	$ (30)	$ (30)