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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per ordinary share	$ 0.855	$ 0.755	$ 0.665
Unrealized gain (loss) on derivatives, net of tax	$ 24,508	$ 12,514	$ (12,152)
Unrealized (loss) gain on short-term interest-bearing investments, net of tax	(410)	568	319
Unrealized (loss) on defined benefit plan, net of tax	$ (5,308)	$ (6,987)	$ (4,920)

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- Definition

Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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