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Restructuring Plans - (Additional Information) (Details) $ in Thousands		3 Months Ended			6 Months Ended		12 Months Ended
	Sep. 19, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Employee	Sep. 30, 2018 USD ($)	Mar. 31, 2019 USD ($) Employee	Mar. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities and other					$ 9,969	$ 1,073
Restructuring and other exit (credits)		$ 6,282		$ 1,121	8,654	2,860
Restructuring costs incurred					3,925
Restructuring reserve		1,542			1,542		$ 2,952
EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)		32		1,007	1,326	2,199
EMEA \| Restructurings Related to Improving Efficiency Related to Supply Chain and General Operations
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities and other								$ 7,400
Expected reduction in number of employees \| Employee							80
Restructuring and other exit (credits)					248
Restructuring costs incurred					425		$ 2,844	1,350
Restructuring reserve		865			865
Expected additional restructuring charges		1,700			1,700
EMEA \| Restructurings Related to Improving Efficiency Related to Supply Chain and General Operations \| Non-cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)								69
EMEA \| Restructurings Related to Improving Efficiency Related to Supply Chain and General Operations \| Cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)							3,104	$ 2,260
EMEA \| Restructurings Related to Improving Efficiencies of General Operations in the Americas
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities and other							$ 2,500
Expected reduction in number of employees \| Employee							35
Restructuring and other exit (credits)							$ 347
Restructuring costs incurred					632		83
Restructuring reserve		156			156
EMEA \| Restructurings Related to Improving Efficiencies of General Operations in the Americas \| Non-cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)					537
Americas
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)		541		0	1,126	0
Americas \| Restructurings Related to Improving Efficiencies of General Operations in the Americas
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities and other							$ 4,100
Expected reduction in number of employees \| Employee							85
Restructuring and other exit (credits)							$ 1,970
Restructuring costs incurred					484		1,480
Restructuring reserve		10			10
Americas \| Restructurings Related to Improving Efficiencies of General Operations in the Americas \| Non-cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)							2,095
Americas \| Second Restructuring Related to Improving Efficiencies of General Operations
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities and other					$ 1,400
Expected reduction in number of employees \| Employee					50
Restructuring and other exit (credits)					$ 1,126
Restructuring costs incurred					687
Restructuring reserve		441			441
Asia
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)		268		114	761	$ 661
Asia \| Restructurings Related to Improving Efficiencies of Reserve Power Operations in EMEA
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities and other							$ 5,300
Expected reduction in number of employees \| Employee							150
Restructuring and other exit (credits)					631		$ 2,772
Restructuring costs incurred					1,697		1,683
Restructuring reserve		70			70
Asia \| Restructurings Related to Improving Efficiencies of Reserve Power Operations in EMEA \| Non-cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)					130		771
Asia \| Restructuring Related to Improving Profitability in India \| Non-cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)				$ 526
Closure Of Facility In Targovishte Bulgaria
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)					$ 1,325		20,242
Expected remaining cost							$ 30,000
Strategy To Exit Manufacture Of Batteries For Diesel-Electric Submarines
Restructuring Cost and Reserve [Line Items]
Proceeds from Sale of Productive Assets		2,031
Gain (Loss) on Disposition of Assets		$ 892
Fixed Asset Write-Off, Kentucky And Tennessee Plants
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)			$ 5,441
Richmond Kentucky Battery Formation Area Fire
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)	$ 1,934
Prepaid Insurance	$ 1,934