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Financing Agreements (Details) (USD $)	Apr. 30, 2012	Apr. 30, 2011
Debt Instrument [Line Items]
Long-term Debt	$ 945,000	$ 1,024,000
Current Maturities of Long Term Debt	(150,000)	(125,000)
Long-term Debt, Excluding Current Maturities	795,000	899,000
Mortgages [Member]
Debt Instrument [Line Items]
Long-term Debt	601,000	632,000
Equipment Loan Note Payable [Member]
Debt Instrument [Line Items]
Long-term Debt	269,000	340,000
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 75,000	$ 52,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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