Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interest	$ 22,249	$ 16,320
Other comprehensive income (loss):
Change in net unrealized gain (loss) on debt securities	(3,412)	6,171
Loss realized in net income	0	22
Total	(3,412)	6,193
Unrealized gain (loss) on currency translation	116	(360)
Deferred income tax effect	(852)	1,433
Total other comprehensive income (loss)	(2,444)	4,400
Total comprehensive income	19,805	20,720
Total comprehensive income attributable to noncontrolling interest	1,181	922
Comprehensive income attributable to parent	$ 18,624	$ 19,798