Stock-Based Compensation (Tables)

12 Months Ended

Apr. 30, 2015

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary Of Stock Options

A summary of options for the fiscal year ended April 30, 2015, is as follows:

(dollars in 000s, except per share amounts)
	Shares		Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding, beginning of the year	3,123		$	17.34
Granted	14		30.51
Exercised	(492	)	15.57
Forfeited or expired	(32	)	19.62
Outstanding, end of the year	2,613		$	17.71	6 years	$	32,740
Exercisable, end of the year	2,464		$	17.64	6 years	$	31,047
Exercisable and expected to vest	2,604		$	17.69	6 years	$	32,685

Summary Of Nonvested Shares

A summary of nonvested shares, nonvested share units and deferred stock units, including those that are performance-based, for the year ended April 30, 2015, is as follows:

(shares in 000s)
	Nonvested Shares and Nonvested Share Units				Performance-Based Nonvested Share Units
	Shares		Weighted-Average Grant Date  Fair Value		Shares		Weighted-Average Grant Date  Fair Value
Outstanding, beginning of the year	1,567		$	18.23	966		$	20.98
Granted	609		33.16		437		37.17
Released	(614	)	17.61		(203	)	17.46
Forfeited	(75	)	26.03		(8	)	29.27
Outstanding, end of the year	1,487		$	24.05	1,192		$	26.26

Assumptions Used To Value Options

The following assumptions were used to value options during the periods:

Year ended April 30,	2015		2014		2013
Options - management and director:
Expected volatility	26.25%		30.89% - 31.57%		29.69% - 31.43%
Expected term	4 years		4 years		4 - 5 years
Dividend yield	2.62%		2.77% - 2.87%		4.18% - 5.21%
Risk-free interest rate	1.43%		1.06% - 1.31%		0.61% - 0.75%
Weighted-average fair value	$	5.18	$	5.57	$	2.79

Performance-Based Nonvested Share Units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Assumptions Used To Value Options

The following assumptions were used to value performance-based nonvested share units using the Monte Carlo valuation model during the periods:

Year ended April 30,	2015			2014			2013
Expected volatility	12.28% - 78.42%			11.75% – 70.17%			12.61% – 71.96%
Expected term	3 years			3 years			3 years
Dividend yield (1)	0% - 2.39%			0% – 2.88%			0% – 5.01%
Risk-free interest rate	0.81		%	0.61		%	0.40		%
Weighted-average fair value	$	37.17		$	28.59		$	16.72

⁽¹⁾  The valuation model assumes that dividends are reinvested by the Company on a continuous basis.