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Treasury Stock (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended
	Feb. 28, 2013	Feb. 29, 2012
Stock Repurchased During Period, Shares	0.2
Payments for Repurchase of Common Stock (in Dollars)	$ 5.8	$ 5.6
Average Price Per Share (in Dollars per share)	$ 28.75

The cash outflow to reacquire common stock during the period.

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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