Business Segments - (Goodwill) (Details) $ in Thousands	3 Months Ended
	Jul. 05, 2020 USD ($)
Segment Reporting Information [Line Items]
Balance at March 31, 2020	$ 663,936
Foreign currency translation adjustment	12,731
Balance as of July 5, 2020	676,667
Energy Systems
Segment Reporting Information [Line Items]
Balance at March 31, 2020	263,150
Foreign currency translation adjustment	4,971
Balance as of July 5, 2020	268,121
Motive Power
Segment Reporting Information [Line Items]
Balance at March 31, 2020	308,497
Foreign currency translation adjustment	6,119
Balance as of July 5, 2020	314,616
Specialty
Segment Reporting Information [Line Items]
Balance at March 31, 2020	92,289
Foreign currency translation adjustment	1,641
Balance as of July 5, 2020	$ 93,930