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Income Taxes (Details 2)	12 Months Ended
	May 31, 2012	May 31, 2011	May 31, 2010
Reconciliation of the U.S. federal statutory tax rate
Federal statutory tax rate	35.00%	35.00%	35.00%
Increase/(Decrease) resulting from:
State income taxes, net of federal tax benefit	3.30%	2.50%	2.30%
Tax-exempt municipal bond interest	(1.80%)	(2.20%)	(2.70%)
Other items	(0.20%)	(0.30%)
Effective income tax rate	36.30%	35.00%	34.60%

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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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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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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense or benefit, net of the federal tax benefit (expense) thereon, recorded during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to income that is exempt from income taxes under enacted tax laws.

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