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SHARE-BASED AWARDS AND OPTIONS (Tables)

6 Months Ended

Nov. 30, 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:

	Three Months Ended								Six Months Ended
	November 30, 2016				November 30, 2015				November 30, 2016				November 30, 2015
	(in thousands)
Share-based compensation expense	$	8,747			$	7,005			$	16,366			$	13,472
Income tax benefit	$	2,206			$	2,279			$	5,778			$	4,637

Schedule of changes in non-vested restricted stock awards activity

The following table summarizes the changes in unvested share-based awards for the six months ended November 30, 2016:

	Shares			Weighted-Average Grant-Date Fair Value
	(in thousands)
Unvested at May 31, 2016	1,606			$	37.25
Granted	436			74.29
Vested	(730	)		31.38
Forfeited	(39	)		44.87
Unvested at November 30, 2016	1,273			$	49.46

Schedule of share-based compensation, stock options, activity

The following summarizes changes in unvested stock option activity for the six months ended November 30, 2016:

	Options			Weighted-Average Exercise Price				Weighted-Average Remaining Contractual Term		Aggregate Intrinsic Value
	(in thousands)							(years)		(in millions)
Outstanding at May 31, 2016	811			$	31.81			5.8		$	36.8
Granted	73			74.66
Forfeited	(1	)		22.93
Exercised	(124	)		22.26
Outstanding at November 30, 2016	759			$	37.51			6.1		$	25.0
Options vested and exercisable at November 30, 2016	502			$	28.88			4.8		$	20.6

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:

	Six Months Ended
	November 30, 2016		November 30, 2015
Risk-free interest rate	1.05%		1.62%
Expected volatility	31.58%		28.65%
Dividend yield	0.06%		0.10%
Expected term (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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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)(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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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