XML 12 R3.htm IDEA: XBRL DOCUMENT

Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands	Jul. 31, 2011	Apr. 30, 2011
Condensed Consolidated Balance Sheets
Property and equipment, accumulated depreciation	$ 797,914	$ 777,342
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.

+ References+ Details

- 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.

+ References+ Details