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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Apr. 30, 2014 | Apr. 30, 2013
--- | --- | ---
Accounts receivable - trade, allowance for doubtful accounts | $ 1,672 | $ 1,332
Property, plant and equipment, accumulated depreciation and amortization | $ 695,935 | $ 645,567
Class A Common Stock [Member] |  |
Common stock, authorized shares | 100,000,000 | 100,000,000
Common stock, par value | $ 0.01 | $ 0.01
Common stock, issued shares | 39,086,000 | 38,662,000
Common stock, outstanding shares | 39,086,000 | 38,662,000
Class B Common Stock [Member] |  |
Common stock, authorized shares | 1,000,000 | 1,000,000
Common stock, par value | $ 0.01 | $ 0.01
Common stock, votes (in votes per share) | 10 | 10
Common stock, issued shares | 988,000 | 988,000
Common stock, outstanding shares | 988,000 | 988,000

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