v2.4.0.6

Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Jan. 28, 2012 | Jul. 30, 2011
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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 | $ 2.0 | $ 2.4

X
- Definition Amount by which fair value of available-for-sale investment in debt securities is lower than cost basis. + References No definition available. + Details
Name: | asna_AvailableForSaleInvestmentInDebtSecuritiesAmountOfCarryingValueExceedingFairValue
Namespace Prefix: | asna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration