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Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Mar. 31, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 796,603	$ 680,022	$ 660,462	$ 670,930	$ 683,042	$ 658,935	$ 617,289	$ 622,625	$ 2,808,017	$ 2,581,891	$ 2,367,149
Gross profit	202,266	164,546	160,880	165,334	167,388	167,310	160,248	163,458	693,026	658,404	651,877
Operating earnings	34,978	49,951	63,357	64,179	67,725	68,785	64,364	69,972	212,465	270,846	237,113
Net earnings	18,546	48,614	47,447	46,020	54,139	(25,779)	43,151	48,322	160,627	119,833	158,223
Net earnings attributable to EnerSys stockholders	$ 18,538	$ 48,417	$ 47,424	$ 45,860	$ 54,018	$ (25,847)	$ 43,222	$ 48,201	$ 160,239	$ 119,594	$ 160,214
Basic earnings per common share attributable to EnerSys stockholders (usd per share)	$ 0.43	$ 1.14	$ 1.13	$ 1.09	$ 1.29	$ (0.61)	$ 1.01	$ 1.11	$ 3.79	$ 2.81	$ 3.69
Diluted earnings per common share attributable to EnerSys stockholders (usd per share)	$ 0.42	$ 1.12	$ 1.11	$ 1.08	$ 1.27	$ (0.61)	$ 1.00	$ 1.09	$ 3.73	$ 2.77	$ 3.64

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