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Restructuring Restructuring (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Apr. 01, 2017 | Mar. 31, 2018 | Apr. 01, 2017 | Sep. 30, 2017
Restructuring Cost and Reserve |  |  |  |  |
Non-cash inventory reserves | $ 7,329 | $ 0 | $ 7,329 | $ 0 |
Restructuring | 24,058 | $ 0 | 24,058 | $ 0 |
Restructuring Reserve | 10,316 |  | 10,316 |  | $ 1,168
2016 Plan |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |
Restructuring Reserve | 740 |  | 740 |  |
2018 Plan |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |
Restructuring |  |  | 31,387 |  |
Restructuring Reserve | $ 9,576 |  | 9,576 |  |
2018 Plan | Other Restructuring |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |
Restructuring |  |  | 2,137 |  |
2018 Plan | Other Restructuring | Inventory |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |
Non-cash inventory reserves |  |  | 7,329 |  |
2018 Plan | Other Restructuring | Finite-Lived Intangible Assets |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |
Restructuring Costs and Asset Impairment Charges |  |  | 14,482 |  |
2018 Plan | Employee Severance |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |
Restructuring |  |  | $ 7,439 |  |

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