Stock-Based Compensation Plans (Tables)

12 Months Ended

May 31, 2013

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

Weighted-Average Grant Date Fair Value of Options Granted and Weighted-Average Assumptions Used for Grants

The following table sets forth the information about the weighted-average grant date fair value of options and the weighted-average assumptions used for such grants.

	2012			2011
Weighted average grant date fair value	$	13.80		$	18.52
Weighted average assumptions used:
Expected volatility	.450			.462
Expected option term in years	6.7			6.7
Risk-free interest rate	1.31		%	2.68		%
Expected dividend yield	.02		%	.74		%

Option Transactions

A summary of option transactions for the three years ended May 31, 2013, follows:

	Shares Under Option		Weighted-Average Option Price
Outstanding at May 31, 2010	1,764,516		$	38.54
Granted	358,450		$	40.22
Exercised	(103,280	)	$	22.51
Canceled	(47,245	)	$	43.13
Outstanding at May 31, 2011	1,972,441		$	39.58
Granted	389,850		$	29.75
Exercised	(105,269	)	$	21.44
Canceled	(111,452	)	$	42.31
Outstanding at May 31, 2012	2,145,570		$	38.54
Exercised	(560,097	)	$	32.90
Canceled	(76,940	)	$	37.72
Outstanding at May 31, 2013	1,508,533		$	40.68

Stock Options Outstanding

The following table summarizes information about stock options outstanding as of May 31, 2013.

	Range of Exercise Prices
	$16.04 - $29.38		$33.57 - $48.60		$50.63 - $70.18
Options outstanding
Shares outstanding	501,792		616,051		390,940
Weighted-average remaining life in years	7.43		5.97		3.23
Weighted-average exercise price	$	27.62	$	39.57	$	59.18
Options exercisable
Shares exercisable	170,822		316,661		390,940
Weighted-average remaining life in years	6.22		4.74		3.23
Weighted-average exercise price	$	25.95	$	40.39	$	59.18