Employee Benefits and Deferred Compensation - Additional Information (Detail) (USD $)	12 Months Ended
	Apr. 25, 2014	Apr. 26, 2013	Apr. 27, 2012
Pension and Other Postretirement Benefits Disclosure [Line Items]
Amount of employee contributions matched at 100%	$ 1,000	$ 1,000	$ 1,000
Maximum amount of matching contributions per employee	$ 3,000	$ 3,000	$ 3,000
Number of years for matched contributions to vest	3 years	3 years	3 years
Contributions matched up to the first $1000.
Pension and Other Postretirement Benefits Disclosure [Line Items]
Percentage of employee contributions matched	100.00%	100.00%	100.00%
Contributions over the first $1,000
Pension and Other Postretirement Benefits Disclosure [Line Items]
Percentage of employee contributions matched	50.00%	50.00%	50.00%