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Note 12 Stock-Based Compensation | 6 Months Ended
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Mar. 31, 2018
Share-based Compensation [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | Stock-Based Compensation Stock-based compensation expense was attributable to:
| Three Months Ended |  | Six Months Ended
| March 31, 2018 |  | April 1, 2017 |  | March 31, 2018 |  | April 1, 2017
| (In thousands)
Stock options | $ | 2,566 |  |  | $ | 380 |  |  | $ | 3,743 |  |  | $ | 930 |
Restricted stock units, including performance based awards | 7,729 |  |  | 7,262 |  |  | 15,194 |  |  | 18,689 |
Total | $ | 10,295 |  |  | $ | 7,642 |  |  | $ | 18,937 |  |  | $ | 19,619 |
Stock-based compensation expense was recognized as follows:
| Three Months Ended |  | Six Months Ended
| March 31, 2018 |  | April 1, 2017 |  | March 31, 2018 |  | April 1, 2017
| (In thousands)
Cost of sales | $ | 1,851 |  |  | $ | 2,035 |  |  | $ | 4,299 |  |  | $ | 4,899 |
Selling, general and administrative | 8,388 |  |  | 5,376 |  |  | 14,552 |  |  | 14,216 |
Research and development | 56 |  |  | 231 |  |  | 86 |  |  | 504 |
Total | $ | 10,295 |  |  | $ | 7,642 |  |  | $ | 18,937 |  |  | $ | 19,619 |
During the second quarter of 2018, the Company's stockholders approved the reservation of an additional 1.8 million shares of common stock for future issuance under the Company's 2009 Incentive Plan. As of March 31, 2018, an aggregate of 10.7 million shares were authorized for future issuance under the Company's stock plans, of which 6.8 million of such shares were issuable upon exercise of outstanding options and delivery of shares upon vesting of restricted stock units and 3.9 million shares of common stock were available for future grant. Stock Options 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 30, 2017 | 3,568 |  |  | 11.83 |  |  | 3.82 |  | 90,327 |
Granted | 200 |  |  | 38.45 |  |  |  |  |
Exercised/Cancelled/Forfeited/Expired | (337 | ) |  | 11.41 |  |  |  |  |
Outstanding as of March 31, 2018 | 3,431 |  |  | 13.42 |  |  | 3.86 |  | 53,074 |
Vested and expected to vest as of March 31, 2018 | 3,429 |  |  | 13.42 |  |  | 3.86 |  | 53,059 |
Exercisable as of March 31, 2018 | 3,234 |  |  | 12.11 |  |  | 3.55 |  | 52,867 |
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 such options at the Company's closing stock price on the date indicated. Restricted Stock Units Activity with respect to the Company's restricted stock units was as follows:
| Number of Shares |  | Weighted- Average Grant Date Fair Value ($) |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value ($)
| (In thousands) |  |  |  |  |  | (In thousands)
Outstanding as of September 30, 2017 | 3,359 |  |  | 27.56 |  |  | 1.51 |  | 124,800 |
Granted | 793 |  |  | 34.85 |  |  |  |  |
Vested/Forfeited/Cancelled | (792 | ) |  | 26.30 |  |  |  |  |
Outstanding as of March 31, 2018 | 3,360 |  |  | 29.58 |  |  | 1.44 |  | 95,080 |
Expected to vest as of March 31, 2018 | 2,574 |  |  | 28.72 |  |  | 1.40 |  | 72,842 |
As of March 31, 2018, unrecognized compensation expense of $43 million is expected to be recognized over a weighted average period of 1.5 years. Additionally, as of March 31, 2018, unrecognized compensation expense related to performance-based restricted stock units for which achievement of the performance criteria is not currently considered probable was $20 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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