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Income Taxes - Reconciliation from United States Statutory Federal Income Tax Rate to Effective Income Tax Rate (Detail)	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Income Tax Disclosure [Abstract]
Federal income tax rate	35.00%	35.00%	35.00%
State taxes, net of federal benefit	1.40%	1.30%	1.30%
Foreign earnings	(11.80%)	(11.90%)	(11.40%)
Other, net	0.10%	0.60%	(0.80%)
EFFECTIVE INCOME TAX RATE	24.70%	25.00%	24.10%

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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