Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended	6 Months Ended
	Oct. 31, 2014	Jan. 30, 2015	Jan. 30, 2015
Fair Labor Standards Act Litigation [Member]
Loss Contingencies [Line Items]
Provision recorded for potential liability related to lawsuits	$ 600	$ 2,150	$ 2,750
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Standby letters of credit		$ 11,530	$ 11,530
Lease Performance Guarantee [Member]
Loss Contingencies [Line Items]
Number of properties for which the company is secondarily liable for lease payments		1	1