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SHAREHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
After-tax amounts:
Accumulated other comprehensive income (loss), after-tax	$ (26,188)	$ (28,635)
Unrealized appreciation on securities
Pre-tax amounts:
Accumulated other comprehensive income (loss), pre-tax	0	0	$ 44,023
After-tax amounts:
Accumulated other comprehensive income (loss), after-tax	0	0	29,071
Unrealized actuarial loss
Pre-tax amounts:
Accumulated other comprehensive income (loss), pre-tax	(33,923)	(37,084)	(21,693)
After-tax amounts:
Accumulated other comprehensive income (loss), after-tax	(26,188)	(28,635)	(12,521)
Accumulated other comprehensive income (loss)
Pre-tax amounts:
Accumulated other comprehensive income (loss), pre-tax	(33,923)	(37,084)	22,330
After-tax amounts:
Accumulated other comprehensive income (loss), after-tax	$ (26,188)	$ (28,635)	$ 16,550

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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