Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Oct. 29, 2011	Jul. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amount by which fair value of available-for-Sale securities is lower than cost basis	$ 2.6	$ 2.4

Amount by which fair value of available-for-sale investment in debt securities is lower than cost basis.

No definition available.

Name:	asna_AvailableForSaleInvestmentInDebtSecuritiesAmountOfCarryingValueExceedingFairValue
Namespace Prefix:	asna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant