| Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] |
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Assets acquired:
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Inventories
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$
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1,409
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Property and equipment
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19,994
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Total assets
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21,403
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Liabilities assumed:
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Accrued expenses
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110
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Total liabilities
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110
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Net tangible assets acquired, net of cash
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21,293
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Goodwill and other intangible assets
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5,290
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Total consideration paid, net of cash acquired
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$
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26,583
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| Business Acquisition, Pro Forma Information [Table Text Block] |
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Nine months ended
January 31,
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2014
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2013
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Total revenues
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$
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5,950,914
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5,535,896
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Net earnings
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112,267
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89,006
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Earnings per common share:
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Basic
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$
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2.92
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2.32
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Diluted
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$
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2.89
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2.31
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