Segments - Information of total assets for company's reportable segments (Details 1) - USD ($) $ in Thousands		Oct. 31, 2017	Jan. 31, 2017	Oct. 31, 2016
Segment Reporting Information [Line Items]
Total Assets		$ 2,259,053	$ 1,851,944	$ 1,423,441
Corporate
Segment Reporting Information [Line Items]
Total Assets	[1]	136,031	146,333	122,704
Operating Segments | Wholesale
Segment Reporting Information [Line Items]
Total Assets		1,871,373	1,477,259	1,072,994
Operating Segments | Retail
Segment Reporting Information [Line Items]
Total Assets		$ 251,649	$ 228,352	$ 227,743

[1] Includes assets not allocated to either reportable segment.