Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2011
Net sales	$ 2,277,559		$ 2,283,369		$ 1,964,462
Cost of goods sold	1,708,203		1,770,664		1,514,618
Gross profit	569,356		512,705		449,844
Operating expenses	312,324		297,806		259,217
Restructuring charges	7,164		4,988		6,813
Legal proceedings settlement income			(900)
Operating earnings	249,868	[1],[2]	210,811	[2],[3]	183,814	[2]
Interest expense	18,719		16,484		22,038
Charges related to refinancing					8,155
Other (income) expense, net	916		3,068		2,177
Earnings before income taxes	230,233		191,259		151,444
Income tax expense	65,275		47,292		38,018
Net earnings	164,958		143,967		113,426
Net losses attributable to noncontrolling interests	(1,550)		(36)
Net earnings attributable to EnerSys stockholders	$ 166,508		$ 144,003		$ 113,426
Net earnings per common share attributable to EnerSys stockholders:
Basic	$ 3.47		$ 2.95		$ 2.30
Diluted	$ 3.42		$ 2.93		$ 2.27
Weighted-average number of common shares outstanding:
Basic	48,022,005		48,748,205		49,376,132
Diluted	48,635,449		49,216,035		50,044,246

[1] Included in Operating earnings were restructuring charges of $370, $1,295, $3,776 and $1,723 for the first, second, third and fourth quarters of fiscal 2013, respectively.

[2] The Company does not allocate interest expense or other (income) expense to the reportable segments.

[3] Included in Operating earnings were restructuring charges of $410, $902, $1,440 and $2,236 for the first, second, third and fourth quarters of fiscal 2012, respectively. Operating earnings also included a legal proceedings settlement income of $900, in the second quarter of fiscal 2012.