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Investments - Additional Information (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |  |  |
Other-than-temporary impairment charges recognized | $ 0 | $ 0 |
Gain (loss) on sale of debt investments | 0 | $ 0 |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Acquisition-related contingent consideration, current | 1,823,000 |  | $ 1,849,000
ICAR | Other current liabilities |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Acquisition-related contingent consideration, current | 1,800,000 |  |
ICAR | Other non-current liabilities |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Acquisition-related contingent consideration, noncurrent | $ 1,200,000 |  |

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- Definition Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 + Details
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- Definition The difference between the carrying value and the sale price of debt securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References No definition available. + Details
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