Segments - Information of total assets for company's reportable segments (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019	Oct. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 2,928,607	$ 2,208,058	$ 2,551,068
Corporate Segment
Segment Reporting Information [Line Items]
Total assets	237,500	182,452	170,635
Operating Segments | Wholesale operations
Segment Reporting Information [Line Items]
Total assets	2,342,209	1,834,610	2,155,840
Operating Segments | Retail
Segment Reporting Information [Line Items]
Total assets	$ 348,898	$ 190,996	$ 224,593