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Available-for-Sale Securities - Interest-bearing Investments in Available-for-Sale Securities (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017
Short Term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities | $ 100,433 | $ 329,997
Maturity period of short term interest-bearing securities included in cash and cash equivalents | Longer than 90 days |
Cash and Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities | $ 30,883 | $ 55,200
Maturity period of short term interest-bearing securities included in cash and cash equivalents | 90 days or less |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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