Commitments and Contingencies (Details) $ in Millions	3 Months Ended
	Oct. 31, 2015 USD ($) Lease	Jan. 31, 2015 USD ($)
Commitments and Contingencies [Abstract]
Capital lease obligation	$ 3.1	$ 3.5
Capital lease obligation included in short-term liabilities	0.5	0.4
Capital lease obligation included in long-term liabilities	$ 2.6	3.1
Stores opened | Lease	20
Stores closed | Lease	3
Increase in retail store lease commitments | Lease	17
Annual Bonuses and Equity Incentive Awards [Abstract]
Annual bonus related expenses included in accrued payroll expenses	$ 2.5	$ 3.5
Litigation Settlement [Abstract]
Gain (Loss) Related to Litigation Settlement	$ 1.9