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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per ordinary share	$ 0.755	$ 0.665	$ 0.595
Unrealized gain (loss) on derivatives, net of tax	$ 12,514	$ (12,152)	$ (5,522)
Unrealized gain (loss) on short-term interest-bearing investments, net of tax	568	319	(39)
Unrealized (loss) on defined benefit plan, net of tax	$ (6,987)	$ (4,920)	$ (4,411)

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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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