Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Aug. 03, 2012
Financial Standby Letter of Credit [Member]
Guarantor Obligations [Line Items]
Standby letters of credit	$ 31,506
Third party lease guarantees [Member]
Guarantor Obligations [Line Items]
Number of properties for which the company is secondarily liable for lease payments	2