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Note 12 Stock-Based Compensation (Tables) | 9 Months Ended
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Jun. 30, 2018
Share-based Compensation [Abstract] |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
| Three Months Ended |  | Nine Months Ended
| June 30, 2018 |  | July 1, 2017 |  | June 30, 2018 |  | July 1, 2017
| (In thousands)
Stock options | $ | 1,362 |  |  | $ | 362 |  |  | $ | 5,105 |  |  | $ | 1,292 |
Restricted stock units, including performance based awards | 8,399 |  |  | 6,927 |  |  | 23,593 |  |  | 25,616 |
Total | $ | 9,761 |  |  | $ | 7,289 |  |  | $ | 28,698 |  |  | $ | 26,908 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
| Three Months Ended |  | Nine Months Ended
| June 30, 2018 |  | July 1, 2017 |  | June 30, 2018 |  | July 1, 2017
| (In thousands)
Cost of sales | $ | 2,055 |  |  | $ | 1,879 |  |  | $ | 6,354 |  |  | $ | 6,778 |
Selling, general and administrative | 7,490 |  |  | 5,276 |  |  | 22,042 |  |  | 19,492 |
Research and development | 216 |  |  | 134 |  |  | 302 |  |  | 638 |
Total | $ | 9,761 |  |  | $ | 7,289 |  |  | $ | 28,698 |  |  | $ | 26,908 |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
| 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 | (381 | ) |  | 11.47 |  |  |  |  |
Outstanding as of June 30, 2018 | 3,387 |  |  | 13.44 |  |  | 3.64 |  | 58,397 |
Vested and expected to vest as of June 30, 2018 | 3,385 |  |  | 13.44 |  |  | 3.63 |  | 58,384 |
Exercisable as of June 30, 2018 | 3,201 |  |  | 12.16 |  |  | 3.34 |  | 58,170 |
Schedule of Restricted Stock Units Award Activity [Table Text Block] |
| 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 | 1,098 |  |  | 33.52 |  |  |  |  |
Vested/Forfeited/Cancelled | (1,089 | ) |  | 25.18 |  |  |  |  |
Outstanding as of June 30, 2018 | 3,368 |  |  | 30.27 |  |  | 1.46 |  | 101,728 |
Expected to vest as of June 30, 2018 | 2,553 |  |  | 29.60 |  |  | 1.46 |  | 77,110 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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