Stock-Based Compensation (Tables)

12 Months Ended

Apr. 30, 2018

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

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, 2018, 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	1,616		$	23.50	1,099		$	30.22
Granted	667		30.03		273		32.66
Released	(635	)	24.11		(197	)	37.20
Forfeited	(109	)	28.22		(48	)	29.55
Outstanding, end of the year	1,539		$	25.54	1,127		$	29.01

Assumptions Used To Value Options

STOCK OPTIONS –A summary of options for the fiscal year ended April 30, 2018, 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	1,702		$	17.99
Granted	274		29.73
Exercised	(1,495	)	17.94
Forfeited or expired	—		—
Outstanding, end of the year	481		$	24.84	7 years	$	1,965
Exercisable, end of the year	190		$	18.08	4 years	$	1,853
Exercisable and expected to vest	435		$	24.34	7 years	$	1,958

Summary Of Stock Options

A summary of options for the fiscal year ended April 30, 2018, 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	1,702		$	17.99
Granted	274		29.73
Exercised	(1,495	)	17.94
Forfeited or expired	—		—
Outstanding, end of the year	481		$	24.84	7 years	$	1,965
Exercisable, end of the year	190		$	18.08	4 years	$	1,853
Exercisable and expected to vest	435		$	24.34	7 years	$	1,958

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,	2018		2017			2016
Expected volatility	13.33% - 81.19%		13.92% - 74.53%			12.85% - 55.27%
Expected term	3 years		3 years			3 years
Dividend yield (1)	0% - 3.23%		0% - 3.68%			0% - 2.70%
Risk-free interest rate	1.42% - 1.55%		0.84		%	0.95		%
Weighted-average fair value	$	32.66	$	25.38		$	30.00

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