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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Sep. 30, 2017
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Cost | $ 38,587 | $ 3,570
Accumulated Amortization | 3,639 | 1,273
Net | $ 34,948 | $ 2,297
Completed technologies |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Amortization Period | 6 years 4 months 24 days | 6 years
Cost | $ 20,341 | $ 2,370
Accumulated Amortization | 2,150 | 833
Net | $ 18,191 | $ 1,537
Customer relationships |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Amortization Period | 4 years 9 months 18 days | 6 years
Cost | $ 17,628 | $ 970
Accumulated Amortization | 1,309 | 341
Net | $ 16,319 | $ 629
Trade names |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Amortization Period | 4 years 6 months | 5 years
Cost | $ 618 | $ 230
Accumulated Amortization | 180 | 99
Net | $ 438 | $ 131

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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://www.xbrl.org/2003/role/presentationRef -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/presentationRef -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/presentationRef -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/presentationRef -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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