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Goodwill and Intangible Assets - Impairment Analysis (Details)	3 Months Ended	12 Months Ended
	Jul. 25, 2015	Jul. 29, 2017	Jul. 30, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate	11.50%	11.00%	11.50%
Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Terminal Growth Rate	1.50%	2.00%	2.00%
Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Terminal Growth Rate	2.50%	3.00%	3.00%

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- 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.

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

+ References

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