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Restructuring Charges (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended | 17 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 01, 2017 USD ($) | Dec. 31, 2016 USD ($) | Apr. 02, 2016 USD ($) | Apr. 01, 2017 USD ($) employee | Apr. 02, 2016 USD ($) | Sep. 30, 2016 USD ($) | Apr. 01, 2017 USD ($) | Sep. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Charge to operations, net | $ 464 |  | $ 4,579 | $ 6,749 | $ 41,726 |  | $ 83,700 |
Restructuring Reserve | 13,149 |  | 15,474 | 13,149 | 15,474 | $ 36,608 | 13,149 | $ 15,254
Employee severance and related benefits [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Charge to operations, net |  |  |  | 2,861 | 41,362 |  |  |
Severance Costs | 100 |  |  |  |  | 600 |  |
Restructuring Reserve | 8,976 |  | 14,517 | 8,976 | 14,517 | 35,177 | 8,976 | 14,086
Facility closures and related costs [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Charge to operations, net |  |  |  | 3,888 | 364 |  |  |
Restructuring Reserve | 4,173 |  | $ 957 | $ 4,173 | $ 957 | $ 1,431 | 4,173 | $ 1,168
Restructuring Plan 2016 [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and Related Cost, Number of Positions Eliminated | employee |  |  |  | 795 |  |  |  |
Q116 plan [Domain] | Employee severance and related benefits [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Charge to operations, net | 400 | $ 6,300 |  |  |  |  |  |
Future Charges [Member] | Facility closures and related costs [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Charge to operations, net |  |  |  | $ 3,000 |  |  |  |
Accrued Expenses and Other Current Liabilities [Member] | Facility closures and related costs [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve | 2,200 |  |  | 2,200 |  |  | 2,200 |
Other Noncurrent Liabilities [Member] | Facility closures and related costs [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve | 2,000 |  |  | 2,000 |  |  | 2,000 |
Restructuring Charges [Member] | Facility closures and related costs [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve | $ 2,200 |  |  | $ 2,200 |  |  | $ 2,200 |

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