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Financing Agreements Maturities of Long-Term Debt (Details) (USD $)	Apr. 30, 2013	Apr. 30, 2012
Fiscal Year Maturities [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 140,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	123,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	532,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Long-term Debt	$ 795,000	$ 945,000

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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