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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Statement of Stockholders' Equity [Abstract]      
Cash dividends declared per ordinary share $ 0.665 $ 0.595 $ 0.520
Unrealized (loss) gain on derivatives, net of tax $ (12,152) $ (5,522) $ 4,696
Unrealized gain (loss) on short-term interest-bearing investments, net of tax 319 (39) 244
Unrealized (loss) on defined benefit plan, net of tax $ (4,920) $ (4,411) $ (4,308)