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Cash, Cash Equivalents and Marketable Securities Available for Sale - Summary of Cash, Cash Equivalents and Marketable Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Cash and Cash Equivalents |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | $ 90,023 | $ 105,618
Fair Value | 90,023 | 105,618
Cash and Cash Equivalents | Cash |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 71,610 | 90,323
Fair Value | 71,610 | 90,323
Cash and Cash Equivalents | Money market funds |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 13,813 | 6,471
Fair Value | 13,813 | 6,471
Cash and Cash Equivalents | Bank Time Deposits |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 4,600 | 8,824
Fair Value | 4,600 | 8,824
Long-term Marketable Securities | Marketable securities |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Trading Securities, Cost | 14,313 | 10,788
Debt Securities, Trading, and Equity Securities, FV-NI | $ 18,059 | $ 13,791

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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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