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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
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

X

- Definition

Available for sale securities debt maturities after four years fair value.

+ References

No definition available.

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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.

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- Definition

Available for sale securities debt maturities after three through four years fair value.

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This item represents the fair value of debt securities which are expected to mature after two year and through three years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

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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

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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