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Restructuring Expenses - Summary of Restructuring Accruals and Certain Facility Closures (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Restructuring Reserve [Roll Forward] |  |  |
Beginning balance | $ 5,228,000 | $ 8,305,000 |
Expense additions | 0 | 0 | $ 4,500,000
Cash payments |  | (3,077,000) |
Ending balance |  | 5,228,000 | 8,305,000
Less: current portion | (1,378,000) | (3,850,000) | (3,077,000)
Non-current | 0 | 1,378,000 | 5,228,000
Facilities charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Beginning balance | 5,228,000 | 8,120,000 |
Expense additions |  |  | 1,700,000
Cash payments | (3,850,000) | (2,892,000) |
Ending balance | 1,378,000 | 5,228,000 | 8,120,000
Employee separation |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Beginning balance | $ 0 | 185,000 |
Expense additions |  |  | 2,800,000
Cash payments |  | (185,000) |
Ending balance |  | $ 0 | $ 185,000

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