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Goodwill and Intangible Assets - Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 110,987 | $ 114,505
Accumulated Amortization | (96,451) | (93,320)
Total | $ 14,536 | $ 21,185
Average Life | 6 years | 6 years
Completed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 82,295 | $ 84,955
Accumulated Amortization | (77,400) | (77,682)
Total | $ 4,895 | $ 7,273
Average Life | 5 years | 5 years
Customer contracts and relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 28,692 | $ 28,947
Accumulated Amortization | (19,051) | (15,091)
Total | $ 9,641 | $ 13,856
Average Life | 8 years | 8 years
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 0 | $ 603
Accumulated Amortization | 0 | (547)
Total | $ 0 | $ 56
Average Life | 0 years | 3 years

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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 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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