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Net Periodic Benefit Cost (Narratives) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ 0	$ 16,324	$ 2,722	$ 0	$ 19,046
Effect of dilutive employee stock options and other share-based awards	338,000	0		363,000	0
Average basic shares outstanding	28,418,000	23,883,000		27,594,000	23,843,000
Share-based Payment Arrangement, Option [Member]
Defined Benefit Plan Disclosure [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		1,149,000		157,707	1,149,000
Pension Plans, Defined Benefiit
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		$ 16,324
Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year						$ 5,166