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Restructuring Charges (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 USD ($) employees | Jul. 02, 2016 employee | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) employee | Sep. 30, 2014 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | $ 76,273 | $ 43,409 | $ 28,406
Number of employees associated with costs | employees | 283 |  |  |  |
Employee Severance And Related Benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | 74,929 | 41,997 | 27,918
Facility Closures and Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | 1,344 | $ 1,412 | 488
Restructuring Plan 2016 |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | 76,900 |  |
Restructuring and Related Cost, Number of Positions Eliminated | employee |  | 810 |  |  |
Restructuring Plan 2016 | Employee Severance And Related Benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | 74,900 |  |
Restructuring Plan 2016 | Facility Closures and Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | 1,300 |  |
Restructuring Plan 2015 |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | 600 |  |
Restructuring and Related Cost, Number of Positions Eliminated | employee |  |  |  | 411 |
Restructuring Plan 2015 | Employee Severance And Related Benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  |  | $ 42,000 |
Restructuring Plan 2015 | Facility Closures and Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  |  | 1,400 |
Operating Leases, Rent Expense, Minimum Rentals |  |  |  | 2,300 |
Operating Leases, Sublease Revenue |  |  |  | $ 900 |
Restructuring Plan 2014 |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | $ 26,800 |  |  |  |
Restructuring Plan 2013 |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  |  |  | $ 1,600
Maximum [Member] | Restructuring Plan 2016 |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | $ 80,000 |  |

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