Operating Leases (Details) (USD $)	12 Months Ended
	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Operating Leases [Abstract]
Lease expiration	Apr. 27, 2030
Total rent liability	$ 12,800,000	$ 11,700,000
Future minimum rentals for all non-cancelable operating leases [Abstract]
2015	51,972,000
2016	48,464,000
2017	45,815,000
2018	42,720,000
2019	38,544,000
2020 and beyond	111,864,000
Future minimum rentals	339,379,000
Future rental income from subleases [Abstract]
2015	4,077,000
2016	4,123,000
2017	3,890,000
2018	3,830,000
2019	3,833,000
2020 and beyond	11,283,000
Future minimum income	31,036,000
Rental expense and rental income for operating leases [Abstract]
Rental expense	51,132,000	47,872,000	48,168,000
Rental income	$ 5,138,000	$ 5,095,000	$ 4,655,000