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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Cash dividends declared per ordinary share | $ 2.06 | $ 1.872 | $ 1.7
Net unrealized (losses) gains on cash flow hedges, net of tax | $ 24,262 | $ 3,037 | $ (34,677)
Unrealized loss on short-term interest-bearing investments, net of tax | 0 | (5,238) | (16,203)
Unrealized loss on defined benefit plan, net of tax | $ (1,627) | $ (2,209) | $ (2,392)

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- Definition Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 + Details
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