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Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Sep. 30, 2017 | Jun. 24, 2017
--- | --- | --- | ---
Liabilities: |  |  |
Total liabilities | $ 7,645 | $ 9,343 | $ 4,095
Liability for contingent consideration |  |  |
Liabilities: |  |  |
Total liabilities | 7,645 | 9,343 | 4,095
Level 1 |  |  |
Liabilities: |  |  |
Total liabilities | 0 | 0 | 0
Level 1 | Liability for contingent consideration |  |  |
Liabilities: |  |  |
Total liabilities | 0 | 0 | 0
Level 2 |  |  |
Liabilities: |  |  |
Total liabilities | 0 | 0 | 0
Level 2 | Liability for contingent consideration |  |  |
Liabilities: |  |  |
Total liabilities | 0 | 0 | 0
Level 3 |  |  |
Liabilities: |  |  |
Total liabilities | 7,645 | 9,343 | 4,095
Level 3 | Liability for contingent consideration |  |  |
Liabilities: |  |  |
Total liabilities | $ 7,645 | $ 9,343 | $ 4,095

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- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
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