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Earnings Per Share Data - Narrative (Details) - shares | Jul. 30, 2022 | Jul. 31, 2021
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Earnings Per Share [Abstract] |  |
Total dilutive and potentially dilutive securities outstanding (in shares) | 0 | 0

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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. Also, the number of shares of preferred stocks, other dilutive securities or potentially dilutive securities that validly exist and are outstanding as of the balance sheet date. + References No definition available. + Details
Name: | dds_DilutiveAndPotentiallyDilutiveSecurities
Namespace Prefix: | dds_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration