Business Segments - (Details) $ in Thousands	3 Months Ended	9 Months Ended
Jan. 03, 2021 USD ($)	Dec. 31, 2019 USD ($)	Jan. 03, 2021 USD ($) segment	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment			3
Net sales	$ 751,067	$ 763,698	$ 2,164,393	$ 2,306,065
Operating earnings by segment	56,071	43,084	164,706	170,130
Inventory step up to fair value relating to acquisitions	0	(3,845)	0	(3,845)
Restructuring charges	(15,196)	(9,417)	(19,702)	(18,071)
Energy Systems
Segment Reporting Information [Line Items]
Inventory step up to fair value relating to acquisitions	0	(1,636)	0	(1,636)
Energy Systems \| Energy Systems
Segment Reporting Information [Line Items]
Net sales	337,248	345,507	1,031,457	1,042,325
Operating earnings by segment	18,407	16,293	63,489	60,337
Restructuring charges	(868)	(4,594)	(2,711)	(6,326)
Motive Power \| Motive Power
Segment Reporting Information [Line Items]
Net sales	304,373	315,517	830,945	995,219
Operating earnings by segment	40,270	30,894	91,695	102,523
Restructuring charges	(14,348)	(520)	(16,791)	(1,512)
Specialty
Segment Reporting Information [Line Items]
Inventory step up to fair value relating to acquisitions	0	(2,209)	0	(2,209)
Specialty \| Specialty
Segment Reporting Information [Line Items]
Net sales	109,446	102,674	301,991	268,521
Operating earnings by segment	12,590	9,159	29,224	29,186
Restructuring charges	20	(4,303)	(200)	(4,792)
Inventory Adjustment \| Energy Systems
Segment Reporting Information [Line Items]
Restructuring charges	0	0	0	(50)
Fixed Asset Write-Off \| Motive Power
Segment Reporting Information [Line Items]
Restructuring charges	0	0	0	(5,380)
Fixed Asset Write-Off \| Specialty
Segment Reporting Information [Line Items]
Restructuring charges	$ 0	$ 0	$ 0	$ (11)

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