Allowance for Doubtful Accounts (Accounts Receivable and Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021	Apr. 30, 2020	Jan. 31, 2020
Segment Reporting Information [Line Items]
Accounts receivable, gross	$ 526,896	$ 510,157	$ 431,590
Allowance for doubtful accounts	(17,466)	(17,459)	(10,447)	$ (710)
Accounts receivable, net	509,430	492,698	421,143
Wholesale
Segment Reporting Information [Line Items]
Accounts receivable, gross	525,568	509,010	428,762
Allowance for doubtful accounts	(17,414)	(17,429)	(10,419)	(628)
Accounts receivable, net	508,154	491,581	418,343
Retail [Member]
Segment Reporting Information [Line Items]
Accounts receivable, gross	1,328	1,147	2,828
Allowance for doubtful accounts	(52)	(30)	(28)	$ (82)
Accounts receivable, net	$ 1,276	$ 1,117	$ 2,800