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Loss Contingencies (Narratives) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 02, 2012
USD ($)
Aug. 02, 2012
EUR (€)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
EUR (€)
Loss Contingencies [Line Items]                
Loss Contingency Accrual     $ 12,545,000   $ 12,545,000      
Estimation of asbestos-related aggregate liability that is probable and estimable     4,914,000   4,914,000      
Insurance Recoveries     0 $ 120,000 290,000 $ 129,000    
Estimation of product-related aggregate liability     6,799,000   6,799,000      
Loss Contingency Alleged Taxes Owed $ 7,300,000 € 6,700,000            
Loss Contingency Alleged Taxes Owed Including Penalties And Interest $ 3,100,000 € 2,800,000            
Accrual for Environmental Loss Contingencies     1,200,000   1,200,000      
Estimated Litigation Liability     153,000   153,000      
Minimum [Member]                
Loss Contingencies [Line Items]                
Product Liability Contingency, Third Party Recovery         2,000,000      
Estimation of asbestos-related aggregate liability that is probable and estimable     4,100,000   4,100,000      
Maximum [Member]                
Loss Contingencies [Line Items]                
Product Liability Contingency, Third Party Recovery         6,000,000      
Estimation of asbestos-related aggregate liability that is probable and estimable     8,000,000   8,000,000      
Magnetek [Member]                
Loss Contingencies [Line Items]                
Estimation of asbestos-related aggregate liability that is probable and estimable     805,000   805,000      
Accrual for Environmental Loss Contingencies     532,000   532,000      
Fiscal year 2004 [Member] | Minimum [Member]                
Loss Contingencies [Line Items]                
Product Liability Contingency, Third Party Recovery         3,000,000      
Fiscal year 2003 [Member] | Minimum [Member]                
Loss Contingencies [Line Items]                
Product Liability Contingency, Third Party Recovery         2,000,000      
Other Noncurrent Liabilities [Member]                
Loss Contingencies [Line Items]                
Loss Contingency Accrual     9,018,000   9,018,000      
Accrued Liabilities                
Loss Contingencies [Line Items]                
Loss Contingency Accrual, Product Liability, Gross     3,527,000   3,527,000      
Scenario, Forecast [Member]                
Loss Contingencies [Line Items]                
Asbestos liability payments             $ 2,000,000  
Loss settlement gross period             12 months 12 months
Loss Contingency Alleged Taxes Owed             $ 2,100,000 € 1,900,000
Loss Contingency Alleged Taxes Owed Including Penalties And Interest             $ 2,800,000 € 2,600,000
Scenario, Forecast [Member] | Minimum [Member]                
Loss Contingencies [Line Items]                
Loss contingency period             37 years 37 years
DEP [Member] | Magnetek [Member]                
Loss Contingencies [Line Items]                
Accrual for Environmental Loss Contingencies     $ 411,000   $ 411,000