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Shareholders' Equity - AOCI Changes (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2017	Mar. 31, 2017
Rollforward of accumulated other comprehensive income (loss), net of tax
Balance		$ 4,560,925
Balance	$ 4,347,394	4,347,394
Unrealized appreciation (depreciation) on securities
Rollforward of accumulated other comprehensive income (loss), net of tax
Balance	33,311	20,899
Other comprehensive income (loss) before reclassifications	(10,507)	1,905
Net current-period other comprehensive income (loss)	(10,507)	1,905
Balance	22,804	22,804
Defined benefit pension plan
Rollforward of accumulated other comprehensive income (loss), net of tax
Balance	(20,737)	(21,103)
Amounts reclassified from accumulated other comprehensive income	366	732
Net current-period other comprehensive income (loss)	366	732
Balance	(20,371)	(20,371)
Accumulated Other Comprehensive Income (Loss)
Rollforward of accumulated other comprehensive income (loss), net of tax
Balance	12,574	(204)
Other comprehensive income (loss) before reclassifications	(10,507)	1,905
Amounts reclassified from accumulated other comprehensive income	366	732
Net current-period other comprehensive income (loss)	(10,141)	2,637
Balance	$ 2,433	$ 2,433

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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