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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interest	$ 30,336	$ 6,792	$ 79,854	$ 42,898
Other comprehensive income (loss):
Change in net unrealized gain (loss) on debt securities	16,897	(9,905)	48,157	(53,377)
(Gain) loss realized in net income	(440)	22	(649)	1,198
Total	16,457	(9,883)	47,508	(52,179)
Unrealized gain (loss) on currency translation	221	0	(24)	0
Deferred income tax effect	4,106	(2,447)	11,590	(14,412)
Total other comprehensive income (loss)	12,572	(7,436)	35,894	(37,767)
Total comprehensive income (loss)	42,908	(644)	115,748	5,131
Total comprehensive income attributable to noncontrolling interest	1,045	0	3,045	0
Comprehensive income (loss) attributable to parent	$ 41,863	$ (644)	$ 112,703	$ 5,131

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