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Stockholders' Equity (Tables) | 12 Months Ended
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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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