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Business Segments - Schedule of Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Jan. 03, 2021 | Oct. 04, 2020 | Jul. 05, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 813,539 | $ 751,067 | $ 708,402 | $ 704,924 | $ 781,803 | $ 763,698 | $ 762,137 | $ 780,230 | $ 2,977,932 | $ 3,087,868 | $ 2,808,017
Operating earnings | 51,669 | 56,071 | 55,415 | 53,220 | 20,065 | 43,084 | 58,710 | 68,336 | 216,375 | 190,195 | 212,465
Inventory step up to fair value relating to acquisitions |  |  |  |  |  |  |  |  | 0 | (1,854) | (10,379)
Restructuring and other exit charges | (20,672) | $ (15,196) | $ (3,119) | $ (1,387) | (2,695) | $ (9,417) | $ (6,282) | $ (2,372) | (40,374) | (20,766) | (34,709)
Impairment of goodwill | (39,713) |  |  |  |  |  |  |  | 0 | (39,713) | 0
Impairment of indefinite-lived intangibles |  |  |  |  |  |  |  |  | 0 | (4,549) | 0
Capital Expenditures |  |  |  |  |  |  |  |  | 70,020 | 101,425 | 70,372
Depreciation and amortization |  |  |  |  |  |  |  |  | 94,082 | 87,344 | 63,348
Property, plant, and equipment, net | 497,056 |  |  |  | 480,014 |  |  |  | 497,056 | 480,014 |
Energy Systems |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,380,278 | 1,357,475 | 1,086,279
Operating earnings |  |  |  |  |  |  |  |  | 67,060 | 67,809 | 45,164
Inventory step up to fair value relating to acquisitions |  |  |  |  |  |  |  |  | 0 | (304) | (7,789)
Restructuring and other exit charges |  |  |  |  |  |  |  |  | (3,187) | (7,284) | (10,593)
Legal proceedings charge, net |  |  |  |  |  |  |  |  | 0 | 0 | (4,363)
Capital Expenditures |  |  |  |  |  |  |  |  | 34,826 | 40,768 | 24,333
Depreciation and amortization |  |  |  |  |  |  |  |  | 57,864 | 53,793 | 32,052
Property, plant, and equipment, net | 224,513 |  |  |  | 182,122 |  |  |  | 224,513 | 182,122 |
Energy Systems | Fixed Asset Write-Off |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other exit charges |  |  |  |  |  |  |  |  | 0 | (50) | 0
Motive Power |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,163,710 | 1,348,193 | 1,391,844
Operating earnings |  |  |  |  |  |  |  |  | 143,541 | 146,814 | 172,749
Restructuring and other exit charges |  |  |  |  |  |  |  |  | (36,798) | (2,021) | (5,751)
Legal proceedings charge, net |  |  |  |  |  |  |  |  | 0 | 0 | (74)
Capital Expenditures |  |  |  |  |  |  |  |  | 14,154 | 22,285 | 26,112
Depreciation and amortization |  |  |  |  |  |  |  |  | 21,706 | 20,900 | 20,725
Property, plant, and equipment, net | 152,468 |  |  |  | 153,438 |  |  |  | 152,468 | 153,438 |
Motive Power | Fixed Asset Write-Off |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other exit charges |  |  |  |  |  |  |  |  | 0 | (5,380) | 0
Specialty |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 433,944 | 382,200 | 329,894
Operating earnings |  |  |  |  |  |  |  |  | 46,148 | 42,454 | 44,077
Inventory step up to fair value relating to acquisitions |  |  |  |  |  |  |  |  | 0 | (1,550) | (2,590)
Restructuring and other exit charges |  |  |  |  |  |  |  |  | (389) | (6,020) | (18,365)
Capital Expenditures |  |  |  |  |  |  |  |  | 21,040 | 38,372 | 19,927
Depreciation and amortization |  |  |  |  |  |  |  |  | 14,512 | 12,651 | 10,571
Property, plant, and equipment, net | $ 120,075 |  |  |  | $ 144,454 |  |  |  | 120,075 | 144,454 |
Specialty | Fixed Asset Write-Off |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other exit charges |  |  |  |  |  |  |  |  | $ 0 | $ (11) | $ 0

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