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Accrued Liabilities (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020
Accrued Liabilities Current [Abstract]
Salaries and other member benefits	$ 46,995		$ 54,497
Warranties	12,984	$ 13,203	17,481	$ 18,576	$ 21,079	$ 18,972
Interest payable	14,608		14,822
Accrued retirement benefits	2,786		2,825
Net current contract liabilities	28,813		29,527
Current portion of restructuring charges	4,503		4,495
Taxes, other than income	20,278		19,453
Purchase of treasury stock on account	11,080		12,516
Other	20,296		27,523
Accrued liabilities	$ 162,343		$ 183,139