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Stockholders' Equity (Tables)

12 Months Ended

May 31, 2014

Equity [Abstract]

Schedule summarizes stock option activity

The following schedule summarizes our stock option activity as of and for the years ended May 31, 2014, May 31, 2013 and May 31, 2012:

	2014													2013							2012
	Shares			Weighted- average exercise price				Weighted average remaining contractual life		Aggregate intrinsic value (in thousands)				Shares			Weighted- average exercise price				Shares			Weighted- average exercise price
Outstanding at beginning of year	2,768,928			$	14.84									2,985,192			$	15.69			2,680,390			$	15.96
Granted	391,175			$	13.01									406,700			$	11.40			1,434,000			$	13.70
Exercised	(105,676	)		$	15.38									(16,835	)		$	11.15			(193,684	)		$	14.22
Forfeited	(278,646	)		$	17.45									(589,787	)		$	17.45			(917,126	)		$	14.22
Expired	(102,030	)		$	15.69									(16,342	)		$	15.69			(18,388	)		$	24.44
Outstanding at end of year	2,673,751			$	14.82			4.56		$	17,540			2,768,928			$	14.84			2,985,192			$	15.69
Options exercisable at year-end	1,675,790			$	16.12			4.54		$	12,906			1,601,028			$	16.12			1,678,559			$	17.01
Options expected to vest in future periods	845,256			$	13.31			5.06		$	3,986			1,069,119			$	13.31			1,075,473			$	14.19

Summary of weighted average fair value of options granted

Weighted average fair value of options granted during the fiscal years ended May 31, is as follows:

	2014				2013				2012
Weighted-average fair value of options granted during the year	$	4.10			$	4.19			$	5.62

Schedule of weighted-average fair value assumptions

The fair value of the options granted under the 1997 and 2004 Plans was estimated at the date of grant using the Black-Scholes option-pricing model assuming no expected dividends and the following weighted-average assumptions:

	2014			2013			2012
Expected stock price volatility	34.40	%		43.91	%		49.06	%
Risk-free interest rate	1.44	%		0.62	%		0.70	%
Expected life of options	4.74			4.62 years			4.59 years

Summary of options outstanding

The following information applies to options outstanding at May 31, 2013:

Range of exercise prices	Number outstanding			Weighted- average remaining life in years		Weighted- average exercise price				Number Exercisable			Weighted- average exercise price
$  6.52 - $11.93	463,965			5.64		$	11.37			65,832			$	10.61
$12.06 - $12.97	343,161			4.86		12.41				155,661			12.44
$13.18 - $13.85	432,426			3.38		13.35				321,348			13.36
$13.92 - $14.31	430,000			4.21		13.95				228,750			13.97
$14.48 - $15.57	202,880			1.09		15.25				202,880			15.25
$15.75 - $16.58	376,196			3.39		16.06				276,196			16.03
$16.75 - $19.94	267,522			1.06		18.19				267,522			18.16
$20.06 - $31.33	157,601			1.26		23.05				157,601			13.81
	2,673,751			4.56		$	14.84			1,675,790			$	16.12

Share based compensation arrangement by share based payment award nonvested shares and weighted average grant date fair value

	Non-Vested Stock Award Units			Weighted Average Grant-Date Fair  Value
Balance as of May 31, 2013	482,644			$	12.14
Granted	473,824			13.37
Cancelled	(109,634	)		12.48
Vested	(148,946	)		12.62
Balance as of May 31, 2014	697,888			13.02

Summary of future expense for awards outstanding

Under the provisions of authoritative guidance on share based payment awards, we expect to recognize the following future expense for awards outstanding as of May 31, 2014 ($ in thousands):

	Unrecognized Compensation Cost				Weighted Average Remaining Vesting Period (in years)
Stock options	$	3,382			2.13
Non-vested stock awards	5,625				2.37
	$	9,007			2.28

Summary of stock-based compensation in accordance with authoritative guidance on share based payment awards

The following table summarizes stock-based compensation in accordance with authoritative guidance on share based payment awards for the years ended May 31, 2014, May 31, 2013 and May 31, 2012, which was allocated as follows:

	May 31, 2014				May 31, 2013				May 31, 2012
	(In thousands)
Cost of sales	$	232			$	271			$	268
Research and development	483				399				738
Sales and marketing	1,672				1,610				1,340
General and administrative	3,035				2,329				1,744
Stock based compensation expense included in operating expenses	5,190				4,338				3,822
Total stock based compensation	5,422				4,609				4,090
Tax benefit	1,657				1,540				1,386
Stock based compensation expense, net of tax	$	3,765			$	3,069			$	2,704

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Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

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Tabular disclosure of the changes in outstanding nonvested shares.

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Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized.

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