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Note 2 - Correction of Immaterial Errors - Financial Statement Revisions (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Cost of goods sold $ 1,920,272 $ 1,772,328
Interest, net 10,506 9,576
Federal and state income taxes 29,744 32,575
Net income 50,097 53,795
Net income per common share    
Basic (in dollars per share) $ 1.30 $ 1.40
Diluted (in dollars per share) $ 1.28 $ 1.39
Deferred income Taxes (asset) 21,192 23,292
Accrued expenses 151,344 139,529
Income taxes payable 16,123  
Deferred income Taxes (liability) 319,959 318,023
Other long term liabilities 19,291 22,500
Retained earnings 711,758 669,386
Net income 50,097 53,795
Deferred income taxes (4,037) (1,828)
Accrued expenses 10,969 23,214
Income taxes 25,782 30,207
Scenario, Previously Reported [Member]
    
Cost of goods sold 1,917,010 1,769,239
Interest, net 10,257 9,456
Federal and state income taxes 31,062 33,869
Net income 52,290 55,710
Net income per common share    
Basic (in dollars per share) $ 1.35 $ 1.45
Diluted (in dollars per share) $ 1.34 $ 1.43
Deferred income Taxes (asset) 12,225 11,878
Accrued expenses 119,887 111,583
Income taxes payable 19,900  
Deferred income Taxes (liability) 320,136 317,953
Other long term liabilities 19,033 22,500
Retained earnings 730,552 685,988
Net income 52,290 55,710
Deferred income taxes (1,836) (3,122)
Accrued expenses 7,458 20,005
Income taxes $ 29,301 $ 30,207