Segments - Information of total assets for company's reportable segments (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Jan. 31, 2015	Apr. 30, 2014
Segment Reporting Information [Line Items]
Total Assets	$ 952,050	$ 1,046,718	$ 803,135
Wholesale
Segment Reporting Information [Line Items]
Total Assets	625,109		575,712
Retail
Segment Reporting Information [Line Items]
Total Assets	190,753		144,300
Corporate
Segment Reporting Information [Line Items]
Total Assets	$ 136,188		$ 83,123