Segments - Information of total assets for company's reportable segments (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020	Apr. 30, 2019
Segment Reporting Information [Line Items]
Total assets	$ 2,798,961	$ 2,565,137	$ 2,446,544
Corporate Segment
Segment Reporting Information [Line Items]
Total assets	812,283	380,130	256,687
Operating Segments | Wholesale
Segment Reporting Information [Line Items]
Total assets	1,754,052	1,912,175	1,813,238
Operating Segments | Retail
Segment Reporting Information [Line Items]
Total assets	$ 232,626	$ 272,832	$ 376,619