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Business Segments - (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 04, 2020
USD ($)
Sep. 30, 2019
USD ($)
Oct. 04, 2020
USD ($)
segment
Sep. 30, 2019
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | segment     3  
Net sales $ 708,402 $ 762,137 $ 1,413,326 $ 1,542,367
Operating earnings by segment 55,415 58,710 108,635 127,046
Restructuring charges 3,119 6,282 4,506 8,654
Energy Systems | Energy Systems        
Segment Reporting Information [Line Items]        
Net sales 340,822 342,925 694,209 696,818
Operating earnings by segment 22,997 20,457 45,082 44,044
Restructuring charges 1,331 622 1,843 1,732
Motive Power | Motive Power        
Segment Reporting Information [Line Items]        
Net sales 263,738 335,315 526,572 679,702
Operating earnings by segment 24,149 34,531 51,425 71,629
Restructuring charges 1,681 434 2,443 992
Specialty | Specialty        
Segment Reporting Information [Line Items]        
Net sales 103,842 83,897 192,545 165,847
Operating earnings by segment 11,388 10,004 16,634 20,027
Restructuring charges 107 (215) 220 489
Inventory Adjustment | Energy Systems        
Segment Reporting Information [Line Items]        
Restructuring charges 0 50 0 50
Fixed Asset Write-Off | Motive Power        
Segment Reporting Information [Line Items]        
Restructuring charges 0 5,380 0 5,380
Fixed Asset Write-Off | Specialty        
Segment Reporting Information [Line Items]        
Restructuring charges $ 0 $ 11 $ 0 $ 11