Consolidated Condensed Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Income Statement [Abstract]
Net sales	$ 617,289	$ 576,048	$ 1,239,914	$ 1,176,651
Cost of goods sold	457,415	412,094	916,943	846,363
Inventory write-off relating to exit activities	0	2,659	0	2,659
Gross profit	159,874	161,295	322,971	327,629
Operating expenses	94,108	93,493	186,761	192,498
Restructuring charges	1,776	4,893	2,609	6,190
Gain on sale of facility			(8)	(47)
Operating earnings	63,990	62,909	133,601	128,941
Interest expense	6,509	5,513	12,243	11,174
Other (income) expense, net	2,382	(582)	5,293	751
Earnings before income taxes	55,099	57,978	116,065	117,016
Income tax expense	11,948	15,185	24,592	29,604
Net earnings	43,151	42,793	91,473	87,412
Net losses attributable to noncontrolling interests	(71)	(2,843)	50	(2,797)
Net earnings attributable to EnerSys stockholders	$ 43,222	$ 45,636	$ 91,423	$ 90,209
Net earnings per common share attributable to EnerSys stockholders:
Basic earnings per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.01	$ 1.05	$ 2.12	$ 2.08
Diluted earnings per common share attributable to EnerSys stockholders (in dollars per share)	1.00	1.04	2.09	2.06
Dividends per common share (in dollars per share)	$ 0.175	$ 0.175	$ 0.35	$ 0.35
Weighted average shares of common stock outstanding:
Basic weighted-average number of common shares outstanding (in shares)	42,938,131	43,426,955	43,194,107	43,348,449
Diluted weighted-average number of common shares outstanding (in shares)	43,327,361	43,949,543	43,745,218	43,889,678