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Business Segments - (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018 USD ($)	Oct. 01, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Oct. 01, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3
Net sales	$ 660,462	$ 617,289	$ 1,331,392	$ 1,239,914
Intersegment sales	50,982	52,720	96,541	93,907
Operating earnings by segment	63,357	64,364	127,536	134,336
Restructuring charges	(1,121)	(1,776)	(2,860)	(2,609)
Reserve power
Segment Reporting Information [Line Items]
Net sales	313,338	292,238	637,356	597,415
Motive power
Segment Reporting Information [Line Items]
Net sales	347,124	325,051	694,036	642,499
Total net sales
Segment Reporting Information [Line Items]
Net sales	660,462	617,289	1,331,392	1,239,914
Americas
Segment Reporting Information [Line Items]
Net sales	388,574	341,504	781,148	696,107
Intersegment sales	7,888	8,979	13,746	16,216
Operating earnings by segment	48,306	44,156	96,042	97,943
Restructuring charges	0	(285)	0	(285)
EMEA
Segment Reporting Information [Line Items]
Net sales	203,997	197,856	414,491	396,933
Intersegment sales	35,039	38,563	67,126	67,380
Operating earnings by segment	13,829	17,802	31,032	31,576
Restructuring charges	(1,007)	(1,491)	(2,199)	(2,324)
Asia
Segment Reporting Information [Line Items]
Net sales	67,891	77,929	135,753	146,874
Intersegment sales	8,055	5,178	15,669	10,311
Operating earnings by segment	2,343	4,182	3,848	7,426
Restructuring charges	(114)	0	(661)	0
Non-cash charges | Asia
Segment Reporting Information [Line Items]
Restructuring charges	$ 0	$ 0	$ (526)	$ 0

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