When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

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Debt (Details) (USD $)	12 Months Ended
Debt (Details) (USD $)	Apr. 25, 2015	Apr. 26, 2014	Apr. 27, 2013
Debt
Total debt	$ 830,000	$ 7,774,000
Less: current portion	(397,000)	(7,497,000)
Long-term debit	433,000	277,000
Cash paid for interest	500,000us-gaap_InterestPaid	500,000us-gaap_InterestPaid	700,000us-gaap_InterestPaid
Industrial revenue bonds
Debt
Total debt		7,100,000
Capital leases
Debt
Total debt	830,000	674,000
Minimum interest rate (in hundredths)	2.70%
Maximum interest rate (in hundredths)	7.60%
Maturities of long-term capital leases
2017	200,000
2018	100,000
2019	100,000
Capital leases \| Maximum
Maturities of long-term capital leases
2020	100,000
Revolving credit facility
Debt
Borrowings outstanding	0
Excess availability	145,000,000
Credit commitment	$ 150,000,000