XML 11 R1.htm IDEA: XBRL DOCUMENT v3.10.0.1
Document and Entity Information - shares
 6 Months Ended
Sep. 30, 2018
Nov. 02, 2018
Document Information [Line Items]    
Document Type 10-Q  
Document Period End Date Sep. 30, 2018  
Entity Registrant Name EnerSys  
Entity Central Index Key 0001289308  
Current Fiscal Year End Date --03-31  
Entity Filer Category Large Accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business false  
Document Fiscal Year Focus 2019  
Trading Symbol ENS  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   42,148,391