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Loss Contingencies (Narratives) (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 02, 2012
USD ($)
Aug. 02, 2012
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2021
EUR (€)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Loss Contingencies [Line Items]                
Loss Contingency Accrual     $ 21,422,000 $ 21,422,000     $ 11,944,000 $ 12,686,000
Loss Contingency Accrual, Product Liability, Gross     21,422,000 21,422,000     11,944,000  
Product Liability Contingency, Third Party Recovery       (3,338,000)        
Estimation of asbestos-related aggregate liability that is probable and estimable     7,150,000 7,150,000        
Estimation of product-related aggregate liability     5,234,000 5,234,000        
Loss Contingency Alleged Taxes Owed $ 8,200,000 € 6,700,000            
Loss Contingency Alleged Taxes Owed Including Penalties And Interest $ 3,400,000 € 2,800,000            
Accrual for Environmental Loss Contingencies     899,000 899,000        
Estimated Litigation Liability     60,000 60,000        
Loss Contingency Accrual, Provision       3,749,000     3,233,000  
Loss Contingency Accrual, Payments       (2,662,000)     (3,975,000)  
Estimated Insurance Recoveries     8,391,000 8,391,000     0  
Loss Contingency Accrual, Product Liability, Net     13,031,000 13,031,000     $ 11,944,000  
Loss Contingency Accrual, Period Increase (Decrease)       1,830,000        
Gain (Loss) Related to Litigation Settlement     3,006,000          
Proceeds from Legal Settlements       2,842,000        
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 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 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     626,000 626,000        
Accrual for Environmental Loss Contingencies     581,000 581,000        
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     17,922,000 17,922,000        
Accrued Liabilities                
Loss Contingencies [Line Items]                
Loss Contingency Accrual, Product Liability, Gross     3,500,000 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         $ 3,200,000 € 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     $ 403,000 $ 403,000