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Summary of Significant Accounting Policies - Additional Information (Detail) - segment | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Summary Of Significant Accounting Policies [Line Items] |  |
Cash and cash equivalents include all highly liquid investments with an original maturity, when purchased, in months |  | three months
Number of operating segments | 3 |
Number of reportable segments | 3 |
Restricted Stock and Restricted Stock Units |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Percentage of restricted stock units granted, vested per year |  | 25.00%
Vesting period, in years |  | 4 years
Minimum |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Percentage of investment ownership, consolidated | 50.00% |
Percentage of investment ownership, equity method | 20.00% |
Estimated useful lives of finite-lived assets |  | 3 years
Minimum | Energy Systems Batteries |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Product warranty for a period |  | one
Minimum | Motive Power Batteries |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Product warranty for a period |  | one
Minimum | Specialty Transportation Batteries |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Product warranty for a period |  | one
Minimum | Building and Improvements |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Property, plant, and equipment, useful life |  | 10 years
Minimum | Machinery and equipment |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Property, plant, and equipment, useful life |  | 3 years
Maximum |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Percentage of investment ownership, equity method | 50.00% |
Percentage of investment ownership, cost method | 20.00% |
Estimated useful lives of finite-lived assets |  | 20 years
Maximum | Energy Systems Batteries |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Product warranty for a period |  | twenty years
Maximum | Motive Power Batteries |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Product warranty for a period |  | seven years
Maximum | Specialty Transportation Batteries |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Product warranty for a period |  | four years
Maximum | Building and Improvements |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Property, plant, and equipment, useful life |  | 33 years
Maximum | Machinery and equipment |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Property, plant, and equipment, useful life |  | 15 years

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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