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Restructuring, Exit and Other Charges - Acquisition and Non-Acquisition Related Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended			24 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	Mar. 31, 2021
Restructuring Cost and Reserve [Line Items]
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
Energy Systems
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit charges									3,187	7,284	10,593
Motive Power
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit charges									36,798	2,021	5,751
Specialty
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit charges									389	6,020	18,365
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges									7,368	10,986	10,623
Exit charges									33,006	9,780	24,086
Restructuring and other exit charges									40,374	20,766	34,709
Employee Severance \| Energy Systems
Restructuring Cost and Reserve [Line Items]
Restructuring charges									3,187	6,808	5,115
Exit charges									0	526	5,477
Restructuring and other exit charges									3,187	7,334	10,592
Employee Severance \| Motive Power
Restructuring Cost and Reserve [Line Items]
Restructuring charges									4,012	1,860	4,795
Exit charges									32,786	5,541	957
Restructuring and other exit charges									36,798	7,401	5,752
Employee Severance \| Specialty
Restructuring Cost and Reserve [Line Items]
Restructuring charges									169	2,318	713
Exit charges									220	3,713	17,652
Restructuring and other exit charges									389	6,031	18,365
Non-Acquisition Related Restructuring Plans
Restructuring Reserve [Roll Forward]
Beginning balance				3,325				2,952	3,325	2,952	2,909	$ 2,952
Accrued									7,368	10,797	8,193
Costs incurred									(8,381)	(10,174)	(7,979)
Foreign currency impact and other									283	(250)	(171)
Ending balance	2,595				3,325				2,595	3,325	2,952	2,595
Non-Acquisition Related Restructuring Plans \| Employee Severance
Restructuring Reserve [Roll Forward]
Beginning balance				3,325				2,356	3,325	2,356	2,893	2,356
Accrued									6,537	10,395	6,554
Costs incurred									(7,550)	(9,179)	(6,893)
Foreign currency impact and other									283	(247)	(198)
Ending balance	2,595				3,325				2,595	3,325	2,356	2,595
Non-Acquisition Related Restructuring Plans \| Other
Restructuring Reserve [Roll Forward]
Beginning balance				$ 0				$ 596	0	596	16	596
Accrued									831	402	1,639
Costs incurred									(831)	(995)	(1,086)
Foreign currency impact and other									0	(3)	27
Ending balance	$ 0				$ 0				$ 0	$ 0	$ 596	$ 0