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Accrued Liabilities (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Loss reserve on contractual lease commitments | [1] |  | $ 1,754 | $ 2,686 |
Restructuring charges |  |  |  | 17,013 |
Payments for restructuring |  |  | 12,445 | 491 |
Non-cash adjustments |  |  | (3,570) |  |
Loss Reserve On Contractual Lease Commitments [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Payments for restructuring |  |  | $ 932 | 1,339 | $ 1,650
Non-cash adjustments |  | $ 2,322 |  |  | $ (2,322)
Duarte Plant Relocation [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  |  | $ 17,013 |
[1] | See Note 15, Accrued liabilities for more information on the loss reserve on contractual lease commitments.

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