Stock-Based Compensation (Tables)

12 Months Ended

Apr. 30, 2012

Stock-Based Compensation [Abstract]

Estimated weighted average fair value for options granted each period

The following table provides the estimated weighted average fair value for options granted each period using the Black-Scholes option-pricing model and the significant weighted average assumptions used in their determination. The expected life represents an estimate of the period of time stock options will be outstanding based on the historical exercise behavior of option recipients. The risk-free interest rate is based on the corresponding U.S. Treasury yield curve in effect at the time of the grant. The expected volatility is based on the historical volatility of the Company's Common Stock price over the estimated life of the option while, the dividend yield is based on the expected dividend payments to be made by the Company.

	For the Twelve Months Ending April 30,
	2012	2011	2010
Fair Value of Options on Grant Date	$14.11	$11.97	$11.32
Weighted Average assumptions:
Expected Life of Options (years)	7.3	7.7	7.8
Risk-Free Interest Rate	2.3%	2.7%	3.3%
Expected Volatility	29.0%	28.9%	29.9%
Expected Dividend Yield	1.6%	1.6%	1.6%
Fair Value of Common Stock on Grant Date	$49.55	$40.02	$35.04

Summary of activity and status of stock option plans

A summary of the activity and status of the Company's stock option plans follows:

	2012				2011		2010
Stock Options	Options (in 000's)	Weighted Average Exercise Price	Weighted Average Remaining Term (in years)	Average Intrinsic Value (in millions)	Options (in 000's)	Weighted Average Exercise Price	Options (in 000's)	Weighted Average Exercise Price
Outstanding at Beginning of Year	4,258	$38.52			4,987	$36.51	5,722	$34.05
Granted	411	$49.55			413	$40.02	695	$35.04
Exercised	(539)	$29.97			(1,133)	$30.23	(1,407)	$25.74
Expired or Forfeited	-	-			(9)	$32.54	(23)	$40.37
Outstanding at End of Year	4,130	$40.74	4.5	$23.7	4,258	$38.52	4,987	$36.51
Exercisable at End of Year	2,301	$40.08	2.9	$14.5	2,218	$35.40	2,513	$31.47
Vested and Expected to Vest in the Future at April 30, 2012	3,992	$40.82	4.5	$22.6

Summary of stock options outstanding and exercisable, by range of exercise prices

The following table summarizes information about stock options outstanding and exercisable at April 30, 2012:

	Options Outstanding			Options Exercisable
Range of Exercise Prices	Number of Options (in 000's)	Weighted Average Remaining Term (in years)	Weighted Average Exercise Price	Number of Options (in 000's)	Weighted Average Exercise Price
$21.44 to $25.32	125	1.0	25.21	125	$25.21
$31.89 to $38.55	1,939	3.6	35.36	1,246	$35.54
$40.02 to $49.55	2,066	5.5	46.72	930	$48.15
Total/Average	4,130	4.5	40.74	2,301	$40.08

Summary of activity for performance-based and other restricted stock awards

Under certain circumstances relating to a change of control or termination, as defined, the restrictions would lapse and shares would vest earlier. Activity for performance-based and other restricted stock awards during fiscal years 2012, 2011 and 2010 was as follows (shares in thousands):

	2012		2011	2010
	Restricted Shares	Weighted Average Grant Date Value	Restricted Shares	Restricted Shares
Nonvested Shares at Beginning of Year	904	$40.15	926	682
Granted	272	$49.42	255	363
Change in shares due to performance	31	$35.04	78	191
Vested and Issued	(159)	$47.06	(349)	(292)
Forfeited	(6)	$48.88	(6)	(18)
Nonvested Shares at End of Year	1,042	$41.31	904	926