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Cover Page - USD ($)
 12 Months Ended
Mar. 31, 2021
May 21, 2021
Oct. 04, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 31, 2021    
Current Fiscal Year End Date --03-31    
Document Transition Report false    
Entity File Number 001-32253    
Entity Registrant Name ENERSYS    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 23-3058564    
Entity Address, Address Line One 2366 Bernville Road    
Entity Address, City or Town Reading    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 19605    
City Area Code 610    
Local Phone Number 208-1991    
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol ENS    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation Flag true    
Entity Public Float     $ 2,908,005,701
Entity Common Stock, Shares Outstanding (in shares)   42,831,879  
Documents Incorporated by Reference Portions of the registrant’s definitive Proxy Statement for its Annual Meeting of Stockholders to be held on or about August 5, 2021 are incorporated by reference in Part III of this Annual Report.    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001289308