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Goodwill and Intangible Assets - Intangible Assets Subject to Amortization (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | $ 3,255 | $ 4,993 | $ 6,126
Gross Carrying Amount | 85,527 | 103,446 |
Accumulated Amortization | (81,428) | (94,210) |
Total | $ 4,099 | $ 9,236 |
Average Life | 6 years | 6 years |
Completed technology |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | $ 1,027 | $ 1,766 | 1,974
Gross Carrying Amount | 71,808 | 83,764 |
Accumulated Amortization | (70,391) | (80,136) |
Total | $ 1,417 | $ 3,628 |
Average Life | 5 years | 5 years |
Customer contracts and relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | $ 2,082 | $ 2,927 | 4,098
Gross Carrying Amount | 13,719 | 19,332 |
Accumulated Amortization | (11,037) | (13,870) |
Total | $ 2,682 | $ 5,462 |
Average Life | 9 years | 9 years |
Trade names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | $ 0 | $ 125 | 25
Non-compete agreements |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | 146 | 175 | $ 29
Gross Carrying Amount | 0 | 350 |
Accumulated Amortization | 0 | (204) |
Total | $ 0 | $ 146 |
Average Life | 2 years | 2 years |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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