Stock-Based Compensation, Performance Awards (Details) (USD $)	6 Months Ended			3 Months Ended	6 Months Ended			12 Months Ended
	Oct. 25, 2014 Performance Shares	Oct. 25, 2014 Performance Shares Minimum	Oct. 25, 2014 Performance Shares Maximum	Jul. 26, 2014 Performance-Based Shares	Oct. 25, 2014 Performance-Based Shares	Oct. 25, 2014 Performance-Based Shares Vesting Based on Performance	Oct. 25, 2014 Performance-Based Shares Vesting Based on Market	Apr. 26, 2014 Performance-Based Shares Vesting Based on Market	Oct. 25, 2014 Performance-Based Units Vesting Based on Performance Awards Granted During 2014	Oct. 25, 2014 Performance-Based Units Vesting Based on Performance Awards Granted During 2013	Oct. 25, 2014 Performance-Based Units Vesting Based on Market Awards Granted During 2014	Oct. 25, 2014 Performance-Based Units Vesting Based on Market Awards Granted During 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				191,783	192,000
Percentage of payout dependent on financial performance	80.00%
Percentage of payout dependent on total shareholder return	20.00%
Performance award opportunity as a percentage of target award		50.00%	200.00%
Performance awards, performance period	3 years
Fair value on date of grant (in dollars per share)						$ 22.91	$ 29.64	$ 26.08
Fair value (in dollars per share)									$ 21.41	$ 21.65	$ 28.22	$ 32.67