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Awards and Restricted Stock Units Issued under 2007 Plan (Detail) (Restricted Stock Plans, 2007 Plan, USD $)	12 Months Ended
	May 31, 2012
Restricted Stock Plans, 2007 Plan
Weighted average grant-date fair value
Beginning Balance	$ 16.49
Shares granted	$ 22.16
Shares vested	$ 23.25
Ending Balance	$ 17.12
Shares
Beginning balance	691,000
Shares granted	96,000
Shares vested	(9,000)
Ending balance	778,000

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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