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Note 13 Stock-Based Compensation | 12 Months Ended
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Sep. 30, 2017
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
| September 30, 2017 |  | October 1, 2016 |  | October 3, 2015
| (In thousands)
Stock options | $ | 1,640 |  |  | $ | 3,943 |  |  | $ | 9,894 |
Restricted stock units, including performance-based awards | 36,280 |  |  | 22,964 |  |  | 10,759 |
Total | $ | 37,920 |  |  | $ | 26,907 |  |  | $ | 20,653 |
Stock-based compensation expense was recognized as follows:
| Year Ended
| September 30, 2017 |  | October 1, 2016 |  | October 3, 2015
| (In thousands)
Cost of sales | $ | 8,959 |  |  | $ | 7,350 |  |  | $ | 6,611 |
Selling, general & administrative | 28,169 |  |  | 18,903 |  |  | 13,859 |
Research & development | 792 |  |  | 654 |  |  | 183 |
Total | $ | 37,920 |  |  | $ | 26,907 |  |  | $ | 20,653 |
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 ratably 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 expire. The Company did not grant any stock options in 2017 and only granted 1,000 stock options in 2016. Assumptions used to estimate the fair value of stock options granted in 2015 were as follows:
| October 3, 2015
Volatility | 52.9 | %
Risk-free interest rate | 1.6 | %
Dividend yield | — |
Expected life of options | 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 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 |
Granted | 1 |  |  | 23.77 |  |  |  |  |
Exercised/Cancelled/Forfeited/Expired | (1,520 | ) |  | 14.13 |  |  |  |  |
Outstanding as of October 1, 2016 | 5,514 |  |  | 12.75 |  |  | 4.10 |  | 81,659 |
Exercised/Cancelled/Forfeited/Expired | (1,946 | ) |  | 14.44 |  |  |  |  |
Outstanding as of September 30, 2017 | 3,568 |  |  | 11.83 |  |  | 3.82 |  | 90,327 |
Exercisable as of September 30, 2017 | 3,469 |  |  | 11.51 |  |  | 3.73 |  | 88,950 |
The weighted-average grant date fair value of stock options granted during 2015 was $12.46. 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 $41.4 million for 2017, $15.9 million for 2016 and $16.2 million for 2015. The following table summarizes information regarding stock options outstanding at September 30, 2017:
Options Outstanding |  | Options Vested and Exercisable
Range of Weighted Exercise Prices |  | Number Outstanding |  | Weighted Average Remaining Contractual Life (Years) |  | Weighted Average Exercise Price ($) |  | Number Exercisable |  | Weighted Average Exercise Price ($)
|  | (In thousands) |  |  |  |  |  | (In thousands) |  |
$1.80-$8.81 |  | 1,922 |  |  | 2.90 |  | 7.88 |  |  | 1,920 |  |  | 7.88 |
$8.82-$11.57 |  | 455 |  |  | 3.55 |  | 11.08 |  |  | 455 |  |  | 11.08 |
$11.58-$15.47 |  | 194 |  |  | 0.92 |  | 12.02 |  |  | 194 |  |  | 12.02 |
$15.48-$23.76 |  | 555 |  |  | 5.55 |  | 15.87 |  |  | 536 |  |  | 15.80 |
$23.77-$24.65 |  | 442 |  |  | 7.20 |  | 24.61 |  |  | 364 |  |  | 24.60 |
$1.80-$24.65 |  | 3,568 |  |  | 3.82 |  | 11.83 |  |  | 3,469 |  |  | 11.51 |
Restricted Stock Units The Company grants restricted stock units to executive officers, directors and certain management employees. These units vest over periods ranging from one to four years or based upon achievement of specified performance criteria and are automatically exchanged for shares of common stock at the vesting date. Compensation expense associated with these units is recognized ratably over the vesting period. Activity with respect to the Company's restricted stock units was as follows:
| Number of Shares |  | Weighted Grant-Date Fair Value Per Share ($) |  | Weighted-Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value ($)
| (In thousands) |  |  |  |  |  | (In thousands)
Outstanding as of September 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 |
Granted | 1,698 |  |  | 23.22 |  |  |  |  |
Vested/Forfeited/Cancelled | (679 | ) |  | 15.33 |  |  |  |  |
Outstanding as of October 1, 2016 | 3,998 |  |  | 19.57 |  |  | 1.35 |  | 110,183 |
Granted | 1,378 |  |  | 34.11 |  |  |  |  |
Vested/Forfeited/Cancelled | (2,017 | ) |  | 16.20 |  |  |  |  |
Outstanding as of September 30, 2017 | 3,359 |  |  | 27.56 |  |  | 1.51 |  | 124,800 |
Expected to vest as of September 30, 2017 | 2,834 |  |  | 26.73 |  |  | 1.44 |  | 105,288 |
The vest-date fair value of restricted stock units vested was $53.2 million for 2017, $10.4 million for 2016 and $6.7 million for 2015. As of September 30, 2017, unrecognized compensation expense of $41.9 million is expected to be recognized over a weighted average period of 1.5 years. Additionally, as of September 30, 2017, unrecognized compensation expense related to performance-based restricted stock units for which achievement of vesting criteria is not currently considered probable was $9.4 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 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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