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Restructuring and Separation Expenses (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) facility
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and separation costs incurred |  | $ 1,322 | $ 8,441 | $ 3,397
Restructuring and separation costs paid |  | 1,000 | 6,800 |
Restructuring and separation costs payable over the next fiscal year |  | $ 300 |  |
Separation costs | $ 3,800 |  | 7,900 |
Restructuring costs related to exited of Canadian facility lease and write-off of associated leasehold improvements |  |  | 500 | $ 800
Number of previously occupied leased facilities | facility |  |  |  | 1
Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and separation costs incurred |  |  |  | $ 2,600
Restructuring and separation costs payable over the next fiscal year |  |  | $ 1,100 |

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