Acquisitions (Details) (USD $)	6 Months Ended
	Oct. 27, 2012
Acquisitions [Abstract]
Number of stores	9
Total purchase price	$ 17,400,000
Indefinite-lived intangible asset	2,200,000
Goodwill	12,800,000
Description of tax deductibility of goodwill and other intangible assets	The goodwill and other intangible assets were recorded in the Retail segment and will be amortized and deducted for federal income tax purposes over 15 years.
Purchase price allocation [Abstract]
Current assets	4,260,000
Goodwill and other intangible assets	14,982,000
Net property, plant, and equipment	368,000
Total assets acquired	19,610,000
Current liabilities	(2,199,000)
Net assets acquired	$ 17,411,000