Derivative Financial Instruments - (Derivatives Designated as Cash Flow Hedges) (Details) - Derivatives Designated as Cash Flow Hedges - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ (2,673)	$ 1,588	$ (3,686)	$ (803)
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(4,597)	(3,110)	(8,679)	(2,452)
Lead forward contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(2,219)	1,526	(3,493)	(968)
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(4,854)	(3,173)	(8,653)	(2,732)
Foreign currency forward contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(454)	62	(193)	165
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ 257	$ 63	$ (26)	$ 280