Stock-Based Compensation	6 Months Ended
Stock-Based Compensation	Oct. 02, 2016
Text Block [Abstract]
Stock-Based Compensation	Stock-Based Compensation As of October 2, 2016, the Company maintains the Second Amended and Restated EnerSys 2010 Equity Incentive Plan, (“2010 EIP”). The 2010 EIP reserved 3,177,477 shares of common stock for the grant of various classes of nonqualified stock options, restricted stock units, market condition-based share units and other forms of equity-based compensation. The Company recognized stock-based compensation expense associated with its equity incentive plans of $4,790 for the second quarter of fiscal 2017 and $6,099 for the second quarter of fiscal 2016. Stock-based compensation expense was $9,857 for the six months of fiscal 2017 and $10,338 for the six months of fiscal 2016. The Company recognizes compensation expense using the straight-line method over the vesting period of the awards, except for awards issued to certain retirement-eligible participants, which are expensed on an accelerated basis. During the six months ended October 2, 2016, the Company granted to non-employee directors 22,401 restricted stock units, pursuant to the 2010 EIP. During the six months ended October 2, 2016, the Company granted to management and other key employees 242,068 non-qualified stock options and 83,720 market condition-based share units that vest three years from the date of grant, and 235,358 restricted stock units that vest 25% each year over four years from the date of grant. Common stock activity during the six months ended October 2, 2016 included the vesting of 139,526 restricted stock units and 232,817 market condition-based share units and the exercise of 263 stock options. As of October 2, 2016, there were 451,668 non-qualified stock options, 621,748 restricted stock units and 447,558 market condition-based share units outstanding.

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.