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Condensed Consolidated Statements Of Earnings (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 31, 2011
Oct. 31, 2010
Oct. 31, 2011
Oct. 31, 2010
Condensed Consolidated Statements Of Earnings [Abstract]        
Total revenue $ 1,782,518 $ 1,349,519 $ 3,656,350 $ 2,711,546
Cost of goods sold (exclusive of depreciation and amortization, shown separately below) 1,519,600 1,122,142 3,126,650 2,250,198
Gross profit 262,918 227,377 529,700 461,348
Operating expenses 171,832 153,263 343,248 305,649
Depreciation and amortization 23,432 20,041 46,327 39,604
Interest, net 8,777 8,195 17,711 10,722
Loss on early retirement of debt   11,350   11,350
Earnings before income taxes 58,877 34,528 122,414 94,023
Federal and state income taxes 21,245 12,836 45,391 35,045
Net earnings $ 37,632 $ 21,692 $ 77,023 $ 58,978
Earnings per common share        
Basic $ 0.99 $ 0.51 $ 2.02 $ 1.27
Diluted $ 0.98 $ 0.51 $ 2.01 $ 1.26
Basic weighted average shares outstanding 38,055,909 42,283,525 38,040,142 46,622,176
Plus effect of stock options 342,934 287,678 328,239 263,899
Diluted weighted average shares outstanding 38,398,843 42,571,203 38,368,381 46,886,075