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Available-for-Sale Securities - Available-for-Sale Securities Debt Maturities Market Value (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Due within one year | $ 63,069 |
1 to 2 years | 44,615 |
2 to 3 years | 20,255 |
3 to 4 years | 2,382 |
Thereafter | 995 |
Fair Value | $ 131,316 | $ 385,197

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- Definition This item represents the fair value of debt securities which are expected to mature after one year and through two years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + Details
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