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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Summary of Assets Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Liabilities: |  |
Contingent earnout liability | $ 12,838 | $ 11,160
Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 52,960 |
Cash and cash equivalents | 347,943 |
Investments | 16,267 |
Other current assets | 31,291 |
Other assets | 3,737 |
Total assets measured at fair value | 452,198 |
Liabilities: |  |
Contingent earnout liability | 18,373 |
Level 1 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 28,386 |
Cash and cash equivalents | 347,943 |
Investments | 15,974 |
Other current assets | 31,291 |
Other assets | 3,737 |
Total assets measured at fair value | 427,331 |
Liabilities: |  |
Contingent earnout liability | 0 |
Level 2 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 24,574 |
Cash and cash equivalents | 0 |
Investments | 293 |
Other current assets | 0 |
Other assets | 0 |
Total assets measured at fair value | 24,867 |
Liabilities: |  |
Contingent earnout liability | 0 |
Level 3 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 0 |
Cash and cash equivalents | 0 |
Investments | 0 |
Other current assets | 0 |
Other assets | 0 |
Total assets measured at fair value | 0 |
Liabilities: |  |
Contingent earnout liability | 18,373 |
Certificates of deposit | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 6,590 |
Certificates of deposit | Level 1 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 0 |
Certificates of deposit | Level 2 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 6,590 |
Certificates of deposit | Level 3 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 0 |
Corporate and municipal debt securities | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 17,984 |
Corporate and municipal debt securities | Level 1 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 0 |
Corporate and municipal debt securities | Level 2 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 17,984 |
Corporate and municipal debt securities | Level 3 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 0 |
U.S. government and federal agency securities | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 28,386 |
U.S. government and federal agency securities | Level 1 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 28,386 |
U.S. government and federal agency securities | Level 2 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | 0 |
U.S. government and federal agency securities | Level 3 | Recurring Fair Value Measurements |  |
Assets: |  |
Short-term investments | $ 0 |

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- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with fair value disclosures required in footnote disclosures to financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents the fair value of assets categorized as other current assets which are not in and of themselves material enough to require separate disclosure. + References No definition available. + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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