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Restructuring and Headquarters Relocation Charges - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 29 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Apr. 01, 2017 USD ($) | Mar. 31, 2018 USD ($) | Apr. 01, 2017 USD ($) | Mar. 31, 2018 USD ($) employee | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges, net | $ 114 | $ 464 | $ 219 | $ 6,749 | $ 84,700 |  |
Restructuring and Related Cost, Number of Positions Eliminated | employee |  |  |  |  | 800 |  |
Headquarters relocation charges | 1,000 |  |  |  |  |  |
Employee severance and related benefits |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges, net |  |  | (395) | 2,861 |  |  |
Restructuring Reserve | 243 | 8,976 | 243 | 8,976 | $ 243 | $ 1,736 | $ 35,177
Facility closures and related costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges, net |  |  | (339) | 3,888 |  |  |
Restructuring Reserve | 3,316 | 4,173 | 3,316 | 4,173 | 3,316 | 4,508 | 1,431
Assumed Sublease Income | 3,400 |  | 3,400 |  | 3,400 |  |
Total 2016 Plan [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and other charges, net |  |  | (734) | 6,749 |  |  |
Restructuring Reserve | 3,559 | $ 13,149 | 3,559 | $ 13,149 | 3,559 | $ 6,244 | $ 36,608
Accrued Expenses and Other Current Liabilities [Member] | Facility closures and related costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve | 1,900 |  | 1,900 |  | 1,900 |  |
Other Noncurrent Liabilities [Member] | Facility closures and related costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve | $ 1,400 |  | $ 1,400 |  | $ 1,400 |  |

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