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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2012
Apr. 30, 2012
Assets [Abstract]    
Cash and cash equivalents $ 89,636 $ 55,919
Receivables 21,254 21,700
Inventories 178,546 170,794
Prepaid expenses 2,637 1,298
Deferred income taxes 13,934 13,143
Income tax receivable   16,424
Total current assets 306,007 279,278
Other assets, net of amortization 13,114 12,403
Goodwill 104,385 104,385
Property and equipment, net of accumulated depreciation of $883,372 at July 31, 2012 and $860,998 at April 30, 2012 1,421,928 1,378,749
Total assets 1,845,434 1,774,815
Liabilities and Shareholders' Equity [Abstract]    
Current maturities of long-term debt 10,740 10,737
Accounts payable 219,944 211,165
Accrued expenses 98,346 84,739
Income taxes payable 2,997  
Total current liabilities 332,027 306,641
Long-term debt, net of current maturities 667,745 667,930
Deferred income taxes 265,933 260,405
Deferred compensation 14,797 14,698
Other long-term liabilities 20,187 19,100
Total liabilities 1,300,689 1,268,774
Shareholders' equity:    
Preferred stock, no par value      
Common stock, no par value 18,192 12,199
Retained earnings 526,553 493,842
Total shareholders' equity 544,745 506,041
Total liabilities and shareholders' equity $ 1,845,434 $ 1,774,815