Goodwill and Other Intangible Assets (Details) - USD ($)	12 Months Ended
	Apr. 29, 2016	Apr. 24, 2015	Apr. 25, 2014
Goodwill [Line Items]
Goodwill and other intangible assets	$ 19,829,000	$ 19,986,000
Impairment of goodwill	0	0	$ 0
Impairment of trade name		2,761,000
Intangible Assets [Roll Forward]
Net intangible carrying amount, beginning	352,000	3,270,000
Amortization expense	(157,000)	(157,000)
Impairment of trade name		(2,761,000)
Net intangible carrying amount, ending	195,000	352,000	3,270,000
Amortization expense per year	156,000
Business Trade Name
Goodwill [Line Items]
Impairment of trade name		2,761,000
Intangible Assets [Roll Forward]
Net intangible carrying amount, beginning	0	2,761,000
Amortization expense	0	0
Impairment of trade name		(2,761,000)
Net intangible carrying amount, ending	0	0	2,761,000
Noncompetition Agreements
Goodwill [Line Items]
Impairment of trade name		0
Intangible Assets [Roll Forward]
Net intangible carrying amount, beginning	352,000	509,000
Amortization expense	(157,000)	(157,000)
Impairment of trade name		0
Net intangible carrying amount, ending	$ 195,000	$ 352,000	$ 509,000
BEF Foods | Noncompetition Agreements
Goodwill [Line Items]
Estimated economic life	5 years