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Basis of Presentation and Accounting Policies (Details) - segment | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 28, 2017 | Jul. 29, 2017 | Jul. 30, 2016
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | 1 |  |
Fiscal period duration |  |  | 371 days
Subsequent Event [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Fiscal period duration |  | 364 days |

X
- Definition Duration of a fiscal period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |