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Income Taxes (Details 2)	12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012
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	3.30%	3.00%	3.30%
Tax settlement	0.00%	1.50%	0.00%
Tax-exempt municipal bond interest	(1.50%)	(1.70%)	(1.80%)
Other items	(0.30%)	(0.20%)	(0.20%)
Effective income tax rate	36.50%	37.60%	36.30%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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