Revolving Line Of Credit - Additional Information (Details) - USD ($)	6 Months Ended
	Aug. 01, 2015	Jan. 31, 2015
Wells Fargo Senior Secured Revolving Credit Facility
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 135,000,000
Line of credit facility, amount outstanding	56,708,000	$ 47,886,000
Amounts in depository under lock-box arrangements	$ 8,349,000	$ 5,987,000
Revolving credit facility, covenant term	The revolving credit facility also requires us to maintain a minimum availability at all times of not less than 10% of the gross borrowing base, and in any event, not less than $5,000
Line of Credit , Maturity Date	Dec. 03, 2019
Wells Fargo Senior Secured Revolving Credit Facility | Minimum
Line Of Credit Facility [Line Items]
Line of credit facility available borrowing capacity	$ 5,000,000
Wells Fargo Stand-by Commercial Letters of Credit
Line Of Credit Facility [Line Items]
Net borrowing available under revolving line of credit	$ 750,000