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Income Taxes (Narratives) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2021
Income tax expense as a percentage of income from continuing operations	21.00%
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ 16,324		$ 19,046
Effective Income Tax Rate Reconciliation, Percent	1.00%	24.00%	12.00%	23.00%
Forecast [Member] \| Minimum [Member]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent					10.00%
Forecast [Member] \| Maximum [Member]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent					12.00%