Employee Benefit Plans (Additional Information- Employee Stock Purchase Plan) (Details) - Employee Stock Purchase Plan - shares shares in Millions	3 Months Ended
	Oct. 24, 2015	Oct. 25, 2014
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares reserved for issuance (in shares)	621
Employee Stock Ownership Plan (ESOP), Plan Description	24-month offering period, which consists of four consecutive 6-month purchase periods.  Employees may purchase a limited number of shares of the Company’s stock at a discount of up to 15% of the lesser of the market value at the beginning of the offering period or the end of each 6-month purchase period.
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date	15.00%
Termination of Stock Plan	Jan. 03, 2020
Stock Issued During Period, Shares, Employee Stock Ownership Plan	0	0
Shares available for issuance	148