Cash and cash equivalents include all highly liquid investments with an original maturity, when purchased

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Cost Method Investment, Ownership Percentage

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Summary Of Significant Accounting Policies [Line Items]

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Summary of Significant Accounting Policies - Additional Information (Detail) - segment	12 Months Ended
	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