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Accrued Liabilities (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019
Accrued Liabilities Current [Abstract]
Salaries and other member benefits	$ 59,157		$ 50,850
Warranties	17,414	$ 18,576	18,972	$ 21,380	$ 21,770	$ 27,309
Interest payable	5,399		15,281
Accrued retirement benefits	3,029		3,051
Restructuring charges			3,395
Taxes, other than income	22,483		13,925
Net current contract liabilities	29,522		24,620
Other	26,576		21,700
Accrued liabilities	$ 163,580		$ 151,794