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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2014	Apr. 30, 2014
Property and equipment, accumulated depreciation	$ 1,093,305	$ 1,062,278
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Common stock, par value (in dollars per share)	$ 0	$ 0

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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X

- Definition

Face amount per share of no-par value common stock.

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Face amount per share of no-par value preferred stock nonredeemable or redeemable solely at the option of the issuer.

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