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Loss Contingencies (Narratives) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 02, 2012
USD ($)
Aug. 02, 2012
EUR (€)
Jun. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
EUR (€)
Sep. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Loss Contingencies [Line Items]                
Loss Contingency Accrual     $ 21,888,000       $ 21,227,000 $ 11,944,000
Insurance Recoveries     (229,000)       (8,052,000)  
Loss Contingency Accrual, Product Liability, Gross     21,888,000       21,227,000  
Estimation of asbestos-related aggregate liability that is probable and estimable     7,056,000          
Estimation of product-related aggregate liability     5,838,000          
Loss Contingency Alleged Taxes Owed $ 7,900,000 € 6,700,000            
Loss Contingency Alleged Taxes Owed Including Penalties And Interest $ 3,300,000 € 2,800,000            
Accrual for Environmental Loss Contingencies     815,000          
Loss Contingency Accrual, Provision     1,218,000     $ 4,634,000    
Loss Contingency Accrual, Payments     (786,000)     $ (3,403,000)    
Estimated Insurance Recoveries     8,281,000       8,052,000  
Loss Contingency Accrual, Product Liability, Net     13,607,000       13,175,000  
Loss Contingency Accrual, Period Increase (Decrease)     1,830,000          
Gain (Loss) Related to Litigation Settlement     3,006,000          
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     5,400,000          
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     9,700,000          
Litigation Settlement, Amount Awarded from Other Party     1,650,000          
Magnetek [Member]                
Loss Contingencies [Line Items]                
Estimation of asbestos-related aggregate liability that is probable and estimable     664,000          
Accrual for Environmental Loss Contingencies     537,000          
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     18,388,000          
Accrued Liabilities                
Loss Contingencies [Line Items]                
Loss Contingency Accrual, Product Liability, Gross     3,500,000          
Gain (Loss) Related to Litigation Settlement     1,500,000          
Forecast [Member]                
Loss Contingencies [Line Items]                
Asbestos liability payments     $ 2,000,000          
Loss settlement gross period     12 months          
Loss Contingency Alleged Taxes Owed       $ 2,300,000 € 1,900,000      
Loss Contingency Alleged Taxes Owed Including Penalties And Interest       $ 3,100,000 € 2,600,000      
Forecast [Member] | Minimum [Member]                
Loss Contingencies [Line Items]                
Loss contingency period     37 years          
DEP [Member] | Magnetek [Member]                
Loss Contingencies [Line Items]                
Accrual for Environmental Loss Contingencies     $ 359,000          
Travelers                
Loss Contingencies [Line Items]                
Increase (Decrease) in Insurance Settlements Receivable             $ 900,000