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SHARE-BASED AWARDS AND OPTIONS (Tables)

9 Months Ended

Feb. 29, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of compensation cost for share-based payment arrangements, allocation of share-based compensation costs by plan

The following table summarizes share-based compensation expense and the related income tax benefit recognized for our share-based awards and stock options (in thousands):

	Three Months Ended								Nine Months Ended
	February 29, 2016				February 28, 2015				February 29, 2016				February 28, 2015
Share-based compensation expense	$	7,000			$	5,682			$	20,472			$	14,827
Income tax benefit	$	2,191			$	1,945			$	6,828			$	4,769

Schedule of changes in non-vested restricted stock awards activity

The following table summarizes the changes in unvested share-based awards for the nine months ended February 29, 2016 (shares in thousands):

		Shares			Weighted-Average Grant-Date Fair Value
Unvested at May 31, 2015		1,848			$	29
Granted		450			57
Vested		(623	)		27
Forfeited		(51	)		34
Unvested at February 29, 2016		1,624			$	37

Schedule of share-based compensation, stock options, activity

The following is a summary of our stock option activity as of and for the nine months ended February 29, 2016:

		Options			Weighted-Average Exercise Price				Weighted-Average Remaining Contractual Term		Aggregate Intrinsic Value
		(in thousands)							(in years)		(in millions)
Outstanding at May 31, 2015		894			$	26			5.2		$	23.9
Granted		145			56
Forfeited		(6	)		16
Exercised		(138	)		23
Outstanding at February 29, 2016		895			$	31			5.6		$	27.3
Options vested and exercisable at February 29, 2016		575			$	23			3.8		$	22.0

Schedule of share-based payment award, stock options, valuation assumptions

Fair value was estimated on the date of grant using the Black-Scholes valuation model with the following weighted-average assumptions:

	Nine Months Ended
	February 29, 2016		February 28, 2015
Risk-free interest rate	1.62%		1.57%
Expected volatility	28.65%		23.65%
Dividend yield	0.10%		0.13%
Expected life (years)	5		5

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Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Tabular disclosure of the changes in outstanding nonvested shares.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
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- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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