Consolidated Statements Of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Net income	$ 17,257	$ 20,130	$ 42,899	$ 40,463
Other comprehensive income (loss), net of tax:
Net change in unrealized gain (losses) on securities available for sale	9,253	3,381	12,176	8,478
Net change in cash flow hedges	(89,769)	(18,936)	(74,564)	(45,758)
Net change in defined benefit plan obligation	452	264	904	528
Other comprehensive income (loss)	(80,064)	(15,291)	(61,484)	(36,752)
Total comprehensive income	$ (62,807)	$ 4,839	$ (18,585)	$ 3,711