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Fair Value Measurements - Schedule of Contingent Consideration Liability (Detail) - Contingent Consideration [Member] - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Contingent consideration liability, beginning balance | $ 14,466 | $ 14,864
Fair value adjustments | (415) | 288
Settlements | (10,979) | (925)
Interest accretion | 254 | 387
Foreign currency translation | (126) | (148)
Contingent consideration liability, ending balance | $ 3,200 | $ 14,466

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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