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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Cash dividends declared per ordinary share | $ 1.545 | $ 1.4075 | $ 1.2675
Unrealized (loss) gain on derivatives, net of tax | $ (46,580) | $ 13,773 | $ 18,836
Unrealized loss on short-term interest-bearing investments, net of tax | (22,797) | (1,274) | (2)
Unrealized loss on defined benefit plan, net of tax | $ (3,099) | $ (3,161) | $ (7,172)

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