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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Sep. 30, 2020
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Cost | $ 52,777 | $ 38,587
Accumulated Amortization | 24,220 | 19,298
Net | $ 28,557 | $ 19,289
Completed technologies |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Weighted Average Amortization Period | 6 years 7 months 6 days | 6 years 4 months 24 days
Cost | $ 31,621 | $ 20,341
Accumulated Amortization | 11,860 | 9,416
Net | $ 19,761 | $ 10,925
Customer relationships |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Weighted Average Amortization Period | 4 years 7 months 6 days | 4 years 9 months 18 days
Cost | $ 20,168 | $ 17,628
Accumulated Amortization | 11,825 | 9,390
Net | $ 8,343 | $ 8,238
Trade names |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Weighted Average Amortization Period | 4 years 8 months 12 days | 4 years 6 months
Cost | $ 988 | $ 618
Accumulated Amortization | 535 | 492
Net | $ 453 | $ 126

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + 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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- Definition Amount after 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 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 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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