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Income Taxes and Other Taxes (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Feb. 29, 2012	Feb. 29, 2012
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate		42.00%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 1.8	$ 1.8
Sales Taxes	$ 19.7

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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