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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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