Segments - Information of total assets for company's reportable segments (Details 1) - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018	Oct. 31, 2017
Segment Reporting Information [Line Items]
Total assets	$ 2,551,068	$ 1,915,177	$ 2,259,053
Corporate Segment
Segment Reporting Information [Line Items]
Total assets	170,635	145,418	136,031
Operating Segments | Wholesale
Segment Reporting Information [Line Items]
Total assets	2,155,840	1,554,191	1,871,373
Operating Segments | Retail
Segment Reporting Information [Line Items]
Total assets	$ 224,593	$ 215,568	$ 251,649