Allowance for Doubtful Accounts (Accounts Receivable and Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Segment Reporting Information [Line Items]
Accounts receivable, gross	$ 431,590
Allowance for doubtful accounts	(10,447)	$ (710)
Accounts receivable, net	421,143
Wholesale
Segment Reporting Information [Line Items]
Accounts receivable, gross	428,762
Allowance for doubtful accounts	(10,419)	(628)
Accounts receivable, net	418,343
Retail
Segment Reporting Information [Line Items]
Accounts receivable, gross	2,828
Allowance for doubtful accounts	(28)	$ (82)
Accounts receivable, net	$ 2,800