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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Tax on unrealized gain (loss) on available for sale securities	$ 6,973	$ (4,401)	$ 1,499
Tax on reclassifications of available for sale securities	(858)	0	0
Tax on adjustment to postemployment benefit obligation	$ (573)	$ (3,487)	$ 2,466

X

- Definition

Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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