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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Oct. 31, 2014
Apr. 30, 2014
Accounts receivable - trade, allowance for doubtful accounts $ 2,356 $ 1,672
Property, plant and equipment, accumulated depreciation and amortization $ 729,254 $ 695,935
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 39,545,000 39,086,000
Common stock, outstanding shares 39,545,000 39,086,000
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