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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, 2020 | Sep. 30, 2019
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Cash and Cash Equivalents |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | $ 157,394 | $ 106,426
Fair Value | 157,394 | 106,426
Cash and Cash Equivalents | Cash |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 122,119 | 77,525
Fair Value | 122,119 | 77,525
Cash and Cash Equivalents | Money market funds |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 35,275 | 22,102
Fair Value | 35,275 | 22,102
Cash and Cash Equivalents | Bank Time Deposits |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 0 | 6,799
Fair Value | 0 | 6,799
Long-term Marketable Securities | Marketable securities |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Trading Securities, Cost | 20,195 | 17,193
Debt Securities, Trading, and Equity Securities, FV-NI | $ 25,513 | $ 20,222

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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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