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Stockholders' Equity and Noncontrolling Interests (Tables) | 9 Months Ended
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Dec. 30, 2018
Equity [Abstract] |
Change In Number Of Shares Of Common Stock Outstanding | The following demonstrates the change in the number of shares of common stock outstanding during the nine months ended December 30, 2018:
Shares outstanding as of March 31, 2018 |  | 41,915,000 |
Purchase of treasury stock |  | (298,003 | )
Shares issued towards purchase consideration of Alpha acquisition |  | 1,177,630 |
Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes |  | 253,081 |
Shares outstanding as of December 30, 2018 |  | 43,047,708 |
Components Of Accumulated Other Comprehensive Income | The components of AOCI, net of tax, as of December 30, 2018 and March 31, 2018, are as follows:
|  | March 31, 2018 |  | Before Reclassifications |  | Amounts Reclassified from AOCI |  | December 30, 2018
Pension funded status adjustment |  | $ | (22,503 | ) |  | $ | — |  |  | $ | 804 |  |  | $ | (21,699 | )
Net unrealized (loss) gain on derivative instruments |  | (3,425 | ) |  | (7,806 | ) |  | 7,364 |  |  | (3,867 | )
Foreign currency translation adjustment |  | (15,789 | ) |  | (101,452 | ) |  | — |  |  | (117,241 | )
Accumulated other comprehensive (loss) income |  | $ | (41,717 | ) |  | $ | (109,258 | ) |  | $ | 8,168 |  |  | $ | (142,807 | )
Reclassification from Accumulated Other Comprehensive Income | The following table presents reclassifications from AOCI during the third quarter ended December 30, 2018:
Components of AOCI |  | Amounts Reclassified from AOCI |  | Location of (Gain) Loss Recognized on Income Statement
Derivatives in Cash Flow Hedging Relationships: |  |  |  |
Net loss on cash flow hedging derivative instruments |  | $ | 6,103 |  |  | Cost of goods sold
Tax benefit |  | (1,434 | ) |  |
Net loss on derivative instruments, net of tax |  | $ | 4,669 |  |  |
Defined benefit pension costs: |  |  |  |
Prior service costs and deferrals |  | $ | 345 |  |  | Net periodic benefit cost, included in other (income) expense, net - See Note 1 and 11
Tax benefit |  | (141 | ) |  |
Net periodic benefit cost, net of tax |  | $ | 204 |  |  |
The following table presents reclassifications from AOCI during the third quarter ended December 31, 2017:
Components of AOCI |  | Amounts Reclassified from AOCI |  | Location of (Gain) Loss Recognized on Income Statement
Derivatives in Cash Flow Hedging Relationships: |  |  |  |
Net loss on cash flow hedging derivative instruments |  | $ | (455 | ) |  | Cost of goods sold
Tax benefit |  | 168 |  |  |
Net loss on derivative instruments, net of tax |  | $ | (287 | ) |  |
Defined benefit pension costs: |  |  |  |
Prior service costs and deferrals |  | $ | 434 |  |  | Net periodic benefit cost, included in other (income) expense, net - See Note 1 and 11
Tax benefit |  | (103 | ) |  |
Net periodic benefit cost, net of tax |  | $ | 331 |  |  |
The following table presents reclassifications from AOCI during the nine months ended December 30, 2018:
Components of AOCI |  | Amounts Reclassified from AOCI |  | Location of (Gain) Loss Recognized on Income Statement
Derivatives in Cash Flow Hedging Relationships: |  |  |  |
Net unrealized loss on derivative instruments |  | $ | 9,625 |  |  | Cost of goods sold
Tax benefit |  | (2,261 | ) |  |
Net unrealized loss on derivative instruments, net of tax |  | $ | 7,364 |  |  |
Defined benefit pension costs: |  |  |  |
Prior service costs and deferrals |  | $ | 1,053 |  |  | Net periodic benefit cost, included in other (income) expense, net - See Note 1 and 11
Tax benefit |  | (249 | ) |  |
Net periodic benefit cost, net of tax |  | $ | 804 |  |  |
The following table presents reclassifications from AOCI during the nine months quarter ended December 31, 2017:
Components of AOCI |  | Amounts Reclassified from AOCI |  | Location of (Gain) Loss Recognized on Income Statement
Derivatives in Cash Flow Hedging Relationships: |  |  |  |
Net loss on cash flow hedging derivative instruments |  | $ | 537 |  |  | Cost of goods sold
Tax benefit |  | (199 | ) |  |
Net loss on derivative instruments, net of tax |  | $ | 338 |  |  |
Defined benefit pension costs: |  |  |  |
Prior service costs and deferrals |  | $ | 1,304 |  |  | Net periodic benefit cost, included in other (income) expense, net - See Note 1 and 11
Tax benefit |  | (308 | ) |  |
Net periodic benefit cost, net of tax |  | $ | 996 |  |  |
Equity Attributable To Parent And Noncontrolling Interests [Table Text Block] | The following demonstrates the change in equity attributable to EnerSys stockholders and nonredeemable noncontrolling interests during the nine months ended December 30, 2018:
|  | Equity Attributable to EnerSys Stockholders |  | Nonredeemable Noncontrolling Interests |  | Total Equity
Balance as of March 31, 2018 |  | $ | 1,195,675 |  |  | $ | 5,436 |  |  | $ | 1,201,111 |
Total comprehensive income: |  |  |  |  |  |
Net earnings |  | 141,701 |  |  | 380 |  |  | 142,081 |
Net unrealized loss on derivative instruments, net of tax |  | (442 | ) |  | — |  |  | (442 | )
Pension funded status adjustment, net of tax |  | 804 |  |  | — |  |  | 804 |
Foreign currency translation adjustment |  | (101,452 | ) |  | (638 | ) |  | (102,090 | )
Total other comprehensive loss, net of tax |  | (101,090 | ) |  | (638 | ) |  | (101,728 | )
Total comprehensive income (loss) |  | 40,611 |  |  | (258 | ) |  | 40,353 |
Other changes in equity: |  |  |  |  |  |
Cash dividends - common stock ($0.525 per share) |  | (22,280 | ) |  | — |  |  | (22,280 | )
Purchase of treasury stock |  | (25,000 | ) |  | — |  |  | (25,000 | )
Reissuance of treasury stock, on LIFO basis, towards Alpha purchase consideration |  | 86,463 |  |  | — |  |  | 86,463 |
Other, including activity related to equity awards |  | 33,633 |  |  | — |  |  | 33,633 |
Balance as of December 30, 2018 |  | $ | 1,309,102 |  |  | $ | 5,178 |  |  | $ | 1,314,280 |

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