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Consolidated Balance Sheets (USD $)
In Thousands
 12 Months Ended
Apr. 30, 2011
Apr. 30, 2010
Assets    
Cash and cash equivalents $ 59,572 $ 151,676
Receivables 20,154 12,111
Inventories 159,200 124,951
Prepaid expenses 1,180 1,129
Deferred income taxes 10,405 9,417
Income taxes receivable 43,376 10,801
Total current assets 293,887 310,085
Property and equipment, at cost    
Land 348,456 297,833
Buildings and leasehold improvements 724,170 621,882
Machinery and equipment 907,483 784,341
Leasehold interest in property and equipment 14,538 13,849
Gross property and equipment 1,994,647 1,717,905
Less accumulated depreciation and amortization 777,342 706,994
Net property and equipment 1,217,305 1,010,911
Other assets, net of amortization 11,721 10,232
Goodwill 88,042 57,547
Total assets 1,610,955 1,388,775
Liabilities and Shareholders' Equity    
Notes payable to bank 600  
Current maturities of long-term debt 1,167 24,577
Accounts payable 215,675 145,334
Accrued expenses    
Wages and related taxes 13,014 11,981
Property taxes 17,283 15,267
Insurance 22,129 20,713
Other 24,632 23,014
Total current liabilities 294,500 240,886
Long-term debt, net of current maturities 678,680 154,754
Deferred income taxes 203,078 141,229
Deferred compensation 13,858 12,788
Other long-term liabilities 16,943 14,799
Total liabilities 1,207,059 564,456
Commitments and contingencies    
Shareholders' equity    
Preferred stock, no par value, none issued    
Common stock, no par value, 37,966,709 and 50,926,162 shares issued and outstanding at April 30, 2011 and 2010, respectively 3,996 64,439
Retained earnings 399,900 759,880
Total shareholders' equity 403,896 824,319
Total liabilities and shareholders' equity $ 1,610,955 $ 1,388,775