Other Comprehensive Income (Loss) (Reclassification out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)		$ 6,528	$ 4,476	$ 13,851	$ 16,461
Reclassification out of Accumulated Other Comprehensive Income
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		(4,936)	2,525	(5,692)	7,524
Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedges
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)		(1,192)	741	(1,153)	2,210
Net of income tax expense (benefit)		4,485	(2,789)	4,337	(8,316)
Reclassification out of Accumulated Other Comprehensive Income | Actuarial Loss
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Nonoperating Income (Expense)	[1]	(572)	(334)	(1,716)	(1,002)
Reclassification out of Accumulated Other Comprehensive Income | Defined Benefit Plan
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)		(121)	(70)	(361)	(210)
Net of income tax expense (benefit)		451	264	1,355	792
Interest Rate Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedges
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest (income) expense, effective portion		$ 5,677	$ (3,530)	$ 5,490	$ (10,526)

[1] This item is included in the computation of net periodic pension cost. See Note 10. Defined Benefit Plan for additional disclosure.