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Restructuring Charges (Narrative) (Details) | 12 Months Ended | 23 Months Ended | 30 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) employee | Sep. 30, 2014 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | $ 6,244,000 | $ 36,608,000 | $ 15,254,000 | $ 6,244,000 | $ 6,244,000 | $ 26,370,000
Restructuring charges | 7,942,000 | 76,273,000 | 43,409,000 |  |  |
Employee Severance And Related Benefits |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | 1,736,000 | 35,177,000 | 14,086,000 | 1,736,000 | 1,736,000 | 25,835,000
Restructuring charges | 2,373,000 | 74,929,000 | 41,997,000 |  |  |
Facility Closures and Other Costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | 4,508,000 | 1,431,000 | 1,168,000 | 4,508,000 | 4,508,000 | $ 535,000
Restructuring charges | 5,569,000 | 1,344,000 | 1,412,000 |  |  |
Restructuring Plan 2016 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | 8,100,000 |  |  | $ 85,300,000 |  |
Number of Employees Terminated |  |  |  | 800 |  |
Restructuring Plan 2016 | Employee Severance And Related Benefits |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | 2,600,000 | 75,800,000 |  |  |  |
Restructuring Plan 2016 | Facility Closures and Other Costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | 5,600,000 | 1,300,000 |  |  |  |
Restructuring Plan 2015 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | 200,000 |  |  |  | $ 42,100,000 |
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 | 200,000 | $ 800,000 | 41,800,000 |  |  |
Restructuring Plan 2015 | Facility Closures and Other Costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  | $ 1,400,000 |  |  |
Other Current Liabilities [Member] | Facility Closures and Other Costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | 2,300,000 |  |  | $ 2,300,000 | $ 2,300,000 |
Other Noncurrent Liabilities [Member] | Facility Closures and Other Costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | 2,200,000 |  |  | 2,200,000 | 2,200,000 |
sublease income [Member] | Facility Closures and Other Costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | $ 4,200,000 |  |  | $ 4,200,000 | $ 4,200,000 |

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