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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012	Apr. 30, 2012
Condensed Consolidated Balance Sheets [Abstract]
Property and equipment, accumulated depreciation	$ 901,517	$ 860,998
Preferred stock, no par value
Common stock, no par value

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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- Definition

Issuance value per share of no-par value, nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share.

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