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Restructuring Plans - (Additional Information) (Details) $ in Thousands			3 Months Ended			9 Months Ended		12 Months Ended		21 Months Ended
	Jan. 04, 2021 USD ($)	Nov. 10, 2020 USD ($) Employee	Jan. 03, 2021 USD ($)	Oct. 04, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 03, 2021 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Jan. 03, 2021 USD ($)
Restructuring Cost and Reserve [Line Items]
Expected remaining cost			$ 10,900			$ 10,900				$ 10,900
Restructuring and other exit charges			15,196		$ 9,417	19,702	$ 18,071
Write-off of assets relating to exit activities						7,292	$ 10,024
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges			3,542			6,448
Exit charges			11,654			13,254
Restructuring and other exit charges			15,196			19,702
Restructuring costs incurred						5,270
Energy Systems | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges			868			2,711
Exit charges			0			0
Restructuring and other exit charges			868			2,711
Motive Power | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges			2,665			3,599
Exit charges			11,683	$ 1,509		13,192
Restructuring and other exit charges			14,348			16,791
Specialty | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges			9			138
Exit charges			(29)			62
Restructuring and other exit charges			(20)			200
Closure of Facility in Hagen, Germany
Restructuring Cost and Reserve [Line Items]
Expected additional restructuring charges		$ 70,000
Estimated number of positions eliminated | Employee		200
Closure of Facility in Hagen, Germany | Cash charges
Restructuring Cost and Reserve [Line Items]
Expected additional restructuring charges		$ 50,000
Closure of Facility in Hagen, Germany | Non Cash Charges
Restructuring Cost and Reserve [Line Items]
Expected additional restructuring charges		$ 20,000	5,515			5,515				5,515
Closure of Facility in Hagen, Germany | Employee Severance
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities			6,168
Closure Of Facility In Targovishte Bulgaria
Restructuring Cost and Reserve [Line Items]
Expected remaining cost									$ 30,000
Restructuring and other exit charges								$ 5,123	$ 20,242
Richmond Kentucky Battery Formation Area Fire
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit charges										46,114
Gain on sale of assets						4,397
Prepaid Insurance			18,408			18,408		12,000		$ 18,408
Restructuring costs incurred			$ 7,500					5,000
Richmond Kentucky Battery Formation Area Fire | Insurance Claim
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred						40,564
Richmond Kentucky Battery Formation Area Fire | Property Claim | Subsequent Event
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	$ 3,206
Richmond Kentucky Battery Formation Area Fire | Business Interruption
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred						12,500
Richmond Kentucky Battery Formation Area Fire | Business Interruption | Subsequent Event
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	$ 2,344
Richmond Kentucky Battery Formation Area Fire | Write-Offs for Damages, Cleanup, Asset Replacement, and Other
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit charges								17,037
Richmond Kentucky Battery Formation Area Fire | Cleanup
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit charges						$ 16,577
Strategy To Exit Manufacture Of Batteries For Diesel-Electric Submarines
Restructuring Cost and Reserve [Line Items]
Proceeds for sale of certain licenses and assets								2,031
Gain on sale of assets								892
Fixed Asset Write-Off, Kentucky And Tennessee Plants
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit charges								$ 5,441

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