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Restructuring Charges (Narrative) (Details) | 12 Months Ended | 23 Months Ended | 30 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) employee | Sep. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | $ 2,415,000 | $ 6,244,000 | $ 36,608,000 | $ 6,244,000 | $ 6,244,000 | $ 15,254,000
Restructuring charges (credit) | (1,003,000) | 7,942,000 | 76,273,000 |  |  |
Payments for Restructuring | 2,756,000 | 37,074,000 | 55,019,000 |  |  |
Old headquarters annual charge | 12,000,000 |  |  |  |  |
Headquarters relocation charges | 4,800,000 |  |  |  |  |
Employee Severance And Related Benefits |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | 0 | 1,736,000 | 35,177,000 | 1,736,000 | 1,736,000 | 14,086,000
Restructuring charges (credit) | (509,000) | 2,373,000 | 74,929,000 |  |  |
Payments for Restructuring | 1,247,000 | 35,069,000 | 53,966,000 |  |  |
Facility Closures and Other Costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | 2,415,000 | 4,508,000 | 1,431,000 | 4,508,000 | 4,508,000 | $ 1,168,000
Restructuring charges (credit) | (494,000) | 5,569,000 | 1,344,000 |  |  |
Payments for Restructuring | 1,509,000 | 2,005,000 | 1,053,000 |  |  |
Restructuring Plan 2016 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | 2,400,000 |  |  |  |  |
Restructuring charges (credit) | (200,000) | 8,200,000 | 77,100,000 | $ 84,500,000 |  |
Payments for Restructuring | 2,600,000 | 36,400,000 | 42,100,000 |  |  |
Number of Employees Terminated |  |  |  | 800 |  |
Restructuring Plan 2015 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges (credit) | (800,000) | 300,000 | (800,000) |  | $ 42,100,000 |
Payments for Restructuring | 200,000 | $ 700,000 | 12,100,000 |  |  |
Restructuring and Related Cost, Number of Positions Eliminated | employee |  |  |  |  | 411 |
Prior Restructuring Plans [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Payments for Restructuring |  |  | $ 800,000 |  |  |
Other Current Liabilities [Member] | Facility Closures and Other Costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | 1,500,000 |  |  |  |  |
Other Noncurrent Liabilities [Member] | Facility Closures and Other Costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | 900,000 |  |  |  |  |
sublease income [Member] | Facility Closures and Other Costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | $ 2,800,000 |  |  |  |  |

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