Stock-Based Compensation (Tables)

12 Months Ended

Apr. 30, 2013

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

A summary of options for the fiscal year ended April 30, 2013, is as follows:



(in 000s, except per share amounts)
	Shares		Weighted–Average Exercise Price		Weighted–Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding, beginning of the year	7,308		$	18.02
Granted	979		17.95
Exercised	(1,414	)	18.08
Forfeited or expired	(2,369	)	19.22
Outstanding, end of the year	4,504		$	17.53	7 years	$	46,202
Exercisable, end of the year	2,646		$	18.33	5 years	$	25,119
Exercisable and expected to vest	4,340		17.58		7 years	44,326

Assumptions Used To Value Options

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



Year ended April 30,	2013		2012		2011
Options – management and director:
Expected volatility	29.69% - 31.43%		31.75% - 32.34%		28.98% - 30.20%
Expected term	4 - 5 years		5 years		5 years
Dividend yield	4.18% - 5.21%		3.43% - 4.80%		4.18% - 5.17%
Risk–free interest rate	0.61% - 0.75%		0.79% - 1.95%		1.26% - 1.92%
Weighted–average fair value	$	2.79	$	3.31	$	2.25
ESPP options:
Expected volatility	22.32% - 27.39%		24.27% - 33.07%		22.75% - 23.31%
Expected term	0.5 years		0.5 years		0.5 years
Dividend yield	4.20% - 5.00%		3.68% - 4.93%		3.86% - 4.80%
Risk–free interest rate	0.11% - 0.15%		0.06% - 0.10%		0.19% - 0.23%
Weighted–average fair value	$	2.60	$	2.78	$	2.16

Summary Of Nonvested Shares

A summary of nonvested shares and nonvested share units for the year ended April 30, 2013, is as follows:



(shares in 000s)
	Shares		Weighted–Average Grant Date Fair Value
Outstanding, beginning of the year	1,454		$	15.10
Granted	1,047		14.38
Released	(446	)	15.57
Forfeited	(249	)	14.59
Outstanding, end of the year	1,806		$	14.64

Summary Of Nonvested Share And Performance-Based Nonvested Share Units

A summary of performance-based nonvested share units for the year ended April 30, 2013, is as follows:



(shares in 000s)
	Shares		Weighted–Average Grant Date Fair Value
Outstanding, beginning of the year	187		$	17.36
Granted	513		16.72
Released	(17	)	16.89
Forfeited	(25	)	16.72
Outstanding, end of the year	658		$	16.89

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 fiscal years 2013 and 2012:



Year ended April 30,	2013			2012
Expected volatility	12.61% – 71.96%			20.68% – 143.12%
Expected term	3 years			3 years
Dividend yield ⁽¹⁾	0% – 5.01%			—		%
Risk–free interest rate	0.40		%	0.75		%
Weighted–average fair value	$	16.72		$	17.46


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