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Earnings Per Share - Weighted Average Common Shares Basic and Common Shares Diluted (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]      
Net earnings attributable to EnerSys stockholders $ 363,735 $ 269,096 $ 175,810
Basic (in shares) 39,760,829 40,669,392 40,809,235
Dilutive effect of:      
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired (in shares) 677,750 702,047 517,520
Diluted weighted-average number of common shares outstanding (in shares) 40,438,579 41,371,439 41,326,755
Basic earnings per common share attributable to EnerSys stockholders (usd per share) $ 9.15 $ 6.62 $ 4.31
Diluted earnings per common share attributable to EnerSys stockholders (usd per share) $ 8.99 $ 6.50 $ 4.25
Anti-dilutive equity awards not included in diluted weighted-average common shares (in shares) 551,411,000 356,893,000 710,678,000