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Stockholders' Equity and Noncontrolling Interests (Tables) | 6 Months Ended
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Sep. 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 six months ended September 30, 2018:
Shares outstanding as of March 31, 2018 |  | 41,915,000 |
Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes |  | 233,391 |
Shares outstanding as of September 30, 2018 |  | 42,148,391 |
Components Of Accumulated Other Comprehensive Income | The components of AOCI, net of tax, as of September 30, 2018 and March 31, 2018, are as follows:
|  | March 31, 2018 |  | Before Reclassifications |  | Amounts Reclassified from AOCI |  | September 30, 2018
Pension funded status adjustment |  | $ | (22,503 | ) |  | $ | — |  |  | $ | 600 |  |  | $ | (21,903 | )
Net unrealized gain (loss) on derivative instruments |  | (3,425 | ) |  | (7,869 | ) |  | 2,695 |  |  | (8,599 | )
Foreign currency translation adjustment |  | (15,789 | ) |  | (85,591 | ) |  | — |  |  | (101,380 | )
Accumulated other comprehensive (loss) income |  | $ | (41,717 | ) |  | $ | (93,460 | ) |  | $ | 3,295 |  |  | $ | (131,882 | )
Reclassification from Accumulated Other Comprehensive Income | The following table presents reclassifications from AOCI during the second quarter ended September 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 |  | $ | 3,308 |  |  | Cost of goods sold
Tax benefit |  | (777 | ) |  |
Net loss on derivative instruments, net of tax |  | $ | 2,531 |  |  |
Defined benefit pension costs: |  |  |  |
Prior service costs and deferrals |  | $ | 340 |  |  | Net periodic benefit cost, included in other (income) expense, net - See Note 1 and 10
Tax benefit |  | (40 | ) |  |
Net periodic benefit cost, net of tax |  | $ | 300 |  |  |
The following table presents reclassifications from AOCI during the second quarter ended October 1, 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 |  | $ | 2,959 |  |  | Cost of goods sold
Tax benefit |  | (1,095 | ) |  |
Net loss on derivative instruments, net of tax |  | $ | 1,864 |  |  |
Defined benefit pension costs: |  |  |  |
Prior service costs and deferrals |  | $ | 440 |  |  | Net periodic benefit cost, included in other (income) expense, net - See Note 1 and 10
Tax benefit |  | (102 | ) |  |
Net periodic benefit cost, net of tax |  | $ | 338 |  |  |
The following table presents reclassifications from AOCI during the six months ended September 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 |  | $ | 3,522 |  |  | Cost of goods sold
Tax benefit |  | (827 | ) |  |
Net unrealized loss on derivative instruments, net of tax |  | $ | 2,695 |  |  |
Defined benefit pension costs: |  |  |  |
Prior service costs and deferrals |  | $ | 708 |  |  | Net periodic benefit cost, included in other (income) expense, net - See Note 1 and 10
Tax benefit |  | (108 | ) |  |
Net periodic benefit cost, net of tax |  | $ | 600 |  |  |
The following table presents reclassifications from AOCI during the six months quarter ended October 1, 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 |  | $ | 992 |  |  | Cost of goods sold
Tax benefit |  | (367 | ) |  |
Net loss on derivative instruments, net of tax |  | $ | 625 |  |  |
Defined benefit pension costs: |  |  |  |
Prior service costs and deferrals |  | $ | 870 |  |  | Net periodic benefit cost, included in other (income) expense, net - See Note 1 and 10
Tax benefit |  | (205 | ) |  |
Net periodic benefit cost, net of tax |  | $ | 665 |  |  |
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 six months ended September 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 |  | 93,284 |  |  | 183 |  |  | 93,467 |
Net unrealized loss on derivative instruments, net of tax |  | (5,174 | ) |  | — |  |  | (5,174 | )
Pension funded status adjustment, net of tax |  | 600 |  |  | — |  |  | 600 |
Foreign currency translation adjustment |  | (85,591 | ) |  | (722 | ) |  | (86,313 | )
Total other comprehensive loss, net of tax |  | (90,165 | ) |  | (722 | ) |  | (90,887 | )
Total comprehensive income (loss) |  | 3,119 |  |  | (539 | ) |  | 2,580 |
Other changes in equity: |  |  |  |  |  |
Cash dividends - common stock ($0.35 per share) |  | (14,747 | ) |  | — |  |  | (14,747 | )
Other, including activity related to equity awards |  | 13,858 |  |  | — |  |  | 13,858 |
Balance as of September 30, 2018 |  | $ | 1,197,905 |  |  | $ | 4,897 |  |  | $ | 1,202,802 |

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