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Note 15 Stock-Based Compensation | 12 Months Ended
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Oct. 03, 2015
Share-based Compensation [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | Stock-Based Compensation Stock-based compensation expense was attributable to:
| Year Ended
| October 3, 2015 |  | September 27, 2014 |  | September 28, 2013
| (In thousands)
Stock options | $ | 9,894 |  |  | $ | 9,820 |  |  | $ | 10,506 |
Restricted stock units | 10,759 |  |  | 8,969 |  |  | 7,018 |
Total | $ | 20,653 |  |  | $ | 18,789 |  |  | $ | 17,524 |
Stock-based compensation expense was as follows:
| Year Ended
| October 3, 2015 |  | September 27, 2014 |  | September 28, 2013
| (In thousands)
Cost of sales | $ | 6,611 |  |  | $ | 5,849 |  |  | $ | 5,464 |
Selling, general & administrative | 13,859 |  |  | 12,861 |  |  | 11,942 |
Research & development | 183 |  |  | 79 |  |  | 118 |
Total | $ | 20,653 |  |  | $ | 18,789 |  |  | $ | 17,524 |
Stock Options The Company's stock option plans provide employees the right to purchase common stock at the fair market value of such shares on the grant date. The Company recognizes compensation expense for such awards over the vesting period, which is generally four to five years. The contractual term of all options is ten years, at which time such options would expire. The Company recognizes compensation expense ratably over the service period. Assumptions used to estimate the fair value of stock options granted were as follows:
| Year Ended
| October 3, 2015 |  | September 27, 2014 |  | September 28, 2013
Volatility | 52.9 | % |  | 67.6 | % |  | 86.0 | %
Risk-free interest rate | 1.6 | % |  | 1.5 | % |  | 0.7 | %
Dividend yield | — |  |  | — |  |  | — |
Expected life of options | 5.0 |  |  | 5.0 |  |  | 5.0 |
Stock option activity was as follows:
| Number of Shares |  | Weighted-Average Exercise Price ($) |  | Weighted-Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value of In-The-Money Options ($)
| (In thousands) |  |  |  |  |  | (In thousands)
Outstanding as of September 29, 2012 | 11,275 |  |  | 13.15 |  |  | 6.54 |  | 18,548 |
Granted | 975 |  |  | 8.83 |  |  |  |  |
Exercised/Cancelled/Forfeited/Expired | (2,688 | ) |  | 13.36 |  |  |  |  |
Outstanding as of September 28, 2013 | 9,562 |  |  | 12.65 |  |  | 5.99 |  | 62,825 |
Granted | 648 |  |  | 15.89 |  |  |  |  |
Exercised/Cancelled/Forfeited/Expired | (2,029 | ) |  | 12.67 |  |  |  |  |
Outstanding as of September 27, 2014 | 8,181 |  |  | 12.90 |  |  | 5.30 |  | 93,767 |
Granted | 567 |  |  | 24.48 |  |  |  |  |
Exercised/Cancelled/Forfeited/Expired | (1,715 | ) |  | 16.13 |  |  |  |  |
Outstanding as of October 3, 2015 | 7,033 |  |  | 13.05 |  |  | 4.94 |  | 53,938 |
Vested and expected to vest as of October 3, 2015 | 6,942 |  |  | 12.97 |  |  | 4.89 |  | 53,609 |
Exercisable as of October 3, 2015 | 5,917 |  |  | 12.25 |  |  | 4.33 |  | 48,655 |
The weighted-average grant date fair value of stock options granted during 2015, 2014 and 2013 was $12.46, $9.14, and $5.91, respectively. The aggregate intrinsic value in the preceding table represents the total pre-tax intrinsic value of in-the-money options that would have been received by the option holders had all option holders exercised their options at the Company's closing stock price on the date indicated. The total intrinsic value of stock options exercised was $16.2 million for 2015, $18.3 million for 2014 and $12.1 million for 2013. As of October 3, 2015, unrecognized compensation expense of $7.1 million is expected to be recognized over a weighted average period of 1.9 years. The following table summarizes information regarding stock options outstanding at October 3, 2015:
Options Outstanding |  | Options Vested and Exercisable
Range of Weighted Exercise Prices |  | Number Outstanding |  | Weighted Average Remaining Contractual Life (Years) |  | Weighted Average Exercise Price ($) |  | Number Exercisable |  | Weighted Average Exercise Price ($)
|  | (In thousands) |  |  |  |  |  | (In thousands) |  |
$1.50-$6.89 |  | 794 |  |  | 3.59 |  | 3.55 |  |  | 793 |  |  | 3.55 |
$6.90-$8.69 |  | 774 |  |  | 6.45 |  | 8.47 |  |  | 513 |  |  | 8.48 |
$8.70-$8.81 |  | 1,350 |  |  | 4.83 |  | 8.76 |  |  | 1,323 |  |  | 8.76 |
$8.82-$11.57 |  | 920 |  |  | 5.45 |  | 10.56 |  |  | 837 |  |  | 10.54 |
$11.58-$15.76 |  | 959 |  |  | 5.69 |  | 13.86 |  |  | 732 |  |  | 13.40 |
$15.77-$21.11 |  | 496 |  |  | 5.88 |  | 16.51 |  |  | 468 |  |  | 16.44 |
$21.12-$28.20 |  | 1,740 |  |  | 4.01 |  | 22.62 |  |  | 1,251 |  |  | 21.89 |
$1.50-$28.20 |  | 7,033 |  |  | 4.94 |  | 13.05 |  |  | 5,917 |  |  | 12.25 |
Restricted Stock Units The Company issues restricted stock units to executive officers, directors and certain management employees. These units vest over periods ranging from one to four years or based upon achievement of specified performance criteria and are automatically exchanged for shares of common stock at the vesting date. Compensation expense associated with these units is recognized ratably over the vesting period. Activity with respect to the Company's restricted stock units was as follows:
| Number of Shares |  | Weighted Grant-Date Fair Value Per Share ($) |  | Weighted-Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value ($)
| (In thousands) |  |  |  |  |  | (In thousands)
Outstanding as of September 29, 2012 | 2,230 |  |  | 9.51 |  |  | 1.08 |  | 21,272 |
Granted | 1,167 |  |  | 9.42 |  |  |  |  |
Vested/Forfeited/Cancelled | (1,629 | ) |  | 7.93 |  |  |  |  |
Outstanding as of September 28, 2013 | 1,768 |  |  | 10.90 |  |  | 2.02 |  | 31,052 |
Granted | 1,204 |  |  | 17.16 |  |  |  |  |
Vested/Forfeited/Cancelled | (631 | ) |  | 13.99 |  |  |  |  |
Outstanding as of September 27, 2014 | 2,341 |  |  | 13.29 |  |  | 2.01 |  | 56,064 |
Granted | 966 |  |  | 23.42 |  |  |  |  |
Vested/Forfeited/Cancelled | (328 | ) |  | 13.79 |  |  |  |  |
Outstanding as of October 3, 2015 | 2,979 |  |  | 16.52 |  |  | 1.52 |  | 59,843 |
Expected to vest as of October 3, 2015 | 2,739 |  |  | 16.28 |  |  | 1.44 |  | 39,386 |
The weighted-average grant date fair value of restricted stock units granted was $23.42, $17.16 and $9.42 in 2015, 2014 and 2013, respectively. The total fair value of restricted stock units vested was $6.7 million for 2015, $9.2 million for 2014 and $8.3 million for 2013. As of October 3, 2015, unrecognized compensation expense of $20.0 million is expected to be recognized over a weighted average period of 1.5 years. Additionally, as of October 3, 2015, unrecognized compensation expense related to performance-based restricted stock units for which achievement of vesting criteria is not considered probable was $13.6 million.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51659978&loc=d3e25284-112666 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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