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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Cash dividends declared per ordinary share | $ 1.7 | $ 1.545 | $ 1.4075
Unrealized (loss) gain on derivatives, net of tax | $ (34,677) | $ (46,580) | $ 13,773
Unrealized loss on short-term interest-bearing investments, net of tax | (16,203) | (22,797) | (1,274)
Unrealized loss on defined benefit plan, net of tax | $ (2,392) | $ (3,099) | $ (3,161)

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