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Accrued Liabilities (Accrued Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Accrued Liabilities Current [Abstract]        
Salaries and other member benefits $ 50,850 $ 115,649    
Warranties 18,972 27,309 $ 20,130 $ 13,597
Interest payable 15,281 13,808    
Accrued retirement benefits 3,051 3,587    
Current portion of loss reserve on contractual lease commitments   1,245    
Net current contract liabilities (Note 3) 24,620 27,891    
Restructuring charges 3,395 507    
Taxes, other than income 13,925 15,708    
Other 21,700 22,423    
Accrued liabilities $ 151,794 $ 228,127