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Cash, Cash Equivalents and Marketable Securities Available for Sale - Summary of Cash, Cash Equivalents and Marketable Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
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Cash and Cash Equivalents |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | $ 106,426 | $ 90,023
Fair Value | 106,426 | 90,023
Cash and Cash Equivalents | Cash |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 77,525 | 71,610
Fair Value | 77,525 | 71,610
Cash and Cash Equivalents | Money market funds |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 22,102 | 13,813
Fair Value | 22,102 | 13,813
Cash and Cash Equivalents | Bank Time Deposits |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 6,799 | 4,600
Fair Value | 6,799 | 4,600
Long-term Marketable Securities | Marketable securities |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Trading Securities, Cost | 17,193 | 14,313
Debt Securities, Trading, and Equity Securities, FV-NI | $ 20,222 | $ 18,059

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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