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Fair Value Measurements - Schedule of Contingent Consideration Liabilities Measured at Fair Value (Detail) - Contingent Consideration [Member] - Significant Unobservable Inputs (Level 3) [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | $ 13,345 | $ 13,870 | $ 14,864 | $ 14,517
Fair value adjustments | 21 | (1,192) | (1,278) | (2,350)
Settlements |  |  | (925) |
Interest accretion | 85 | 563 | 272 | 1,547
Foreign currency translation loss (gain) | (592) | 600 | (74) | 127
Ending balance | $ 12,859 | $ 13,841 | $ 12,859 | $ 13,841

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