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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2013
Apr. 30, 2012
Assets [Abstract]    
Cash and cash equivalents $ 26,521 $ 55,919
Receivables 19,790 21,700
Inventories 185,126 170,794
Prepaid expenses 1,953 1,298
Deferred income taxes 10,603 13,143
Income tax receivable 16,563 16,424
Total current assets 260,556 279,278
Other assets, net of amortization 13,931 12,403
Goodwill 114,661 104,385
Property and equipment, net of accumulated depreciation of $926,087 at January 31, 2013 and $860,998 at April 30, 2012 1,545,312 1,378,749
Total assets 1,934,460 1,774,815
Liabilities and Shareholders' Equity [Abstract]    
Notes payable to bank 58,600  
Current maturities of long-term debt 13,307 10,737
Accounts payable 197,245 211,165
Accrued expenses 97,005 84,739
Total current liabilities 366,157 306,641
Long-term debt, net of current maturities 660,779 667,930
Deferred income taxes 286,963 260,405
Deferred compensation 15,326 14,698
Other long-term liabilities 21,749 19,100
Total liabilities 1,350,974 1,268,774
Shareholders' equity:    
Preferred stock, no par value      
Common stock, no par value 21,254 12,199
Retained earnings 562,232 493,842
Total shareholders' equity 583,486 506,041
Total liabilities and shareholders' equity $ 1,934,460 $ 1,774,815