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Income Taxes (Details 2)	12 Months Ended
Income Taxes (Details 2)	May 31, 2013	May 31, 2012	May 31, 2011
Income Tax Disclosure [Abstract]
Federal statutory tax rate	35.00%	35.00%	35.00%
Increase/(decrease) resulting from:
State income taxes, net of federal tax benefit	3.00%	3.30%	2.50%
Tax settlement	1.50%	0.00%	0.00%
Tax-exempt municipal bond interest	(1.70%)	(1.80%)	(2.20%)
Other items	(0.20%)	(0.20%)	(0.30%)
Effective income tax rate	37.60%	36.30%	35.00%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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