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Restructuring and Other Costs, Net - Schedule of Accrual Activity Relating to Restructuring Reserves (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Restructuring Cost And Reserve [Line Items] |  |  |  |
Balance at September 30, 2020 |  |  | $ 2,702 |
Restructuring and other costs, net | $ 1,760 | $ 3,301 | 2,777 | $ 13,725
Non-cash adjustments |  |  | 2,749 |
Cash payments |  |  | (3,556) |
Foreign exchange impact on ending balance |  |  | (39) |
Balance at June 30, 2021 | 4,633 |  | 4,633 |
Personnel |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Balance at September 30, 2020 |  |  | 764 |
Restructuring and other costs, net |  | 2,452 | 381 | 3,133
Cash payments |  |  | (719) |
Foreign exchange impact on ending balance |  |  | 6 |
Balance at June 30, 2021 | 432 |  | 432 |
Facilities |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Balance at September 30, 2020 |  |  | 10 |
Restructuring and other costs, net | 447 |  | 1,012 |
Non-cash adjustments |  |  | 2,749 |
Cash payments |  |  | (852) |
Foreign exchange impact on ending balance |  |  | (45) |
Balance at June 30, 2021 | 2,874 |  | 2,874 |
Restructuring Subtotal |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Balance at September 30, 2020 |  |  | 774 |
Restructuring and other costs, net | 447 | 2,452 | 1,393 | 3,133
Non-cash adjustments |  |  | 2,749 |
Cash payments |  |  | (1,571) |
Foreign exchange impact on ending balance |  |  | (39) |
Balance at June 30, 2021 | 3,306 |  | 3,306 |
Other |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Balance at September 30, 2020 |  |  | 1,928 |
Restructuring and other costs, net | 1,313 | $ 849 | 1,384 | $ 10,592
Cash payments |  |  | (1,985) |
Balance at June 30, 2021 | $ 1,327 |  | $ 1,327 |

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Amount of decrease in the reserve for full or partial settlement through consideration other than cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Definition Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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