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Income Taxes and Other Taxes (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Feb. 28, 2013	May 31, 2013
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate		38.00%
Sales Tax Settlement Payments (in Dollars)	$ 15.3

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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