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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

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