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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |  |
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Mar. 31, 2019 USD ($) | Dec. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jul. 01, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Oct. 01, 2017 USD ($) | Jul. 02, 2017 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) segment shares | Mar. 31, 2017 USD ($) | Apr. 01, 2019 USD ($) | Apr. 01, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents include all highly liquid investments with an original maturity, when purchased, in months |  |  |  |  |  |  |  |  |  | 3 months |  |  |
Number of geographical regions | segment |  |  |  |  |  |  |  |  |  | 3 |  |  |
Reclassification of goodwill impairment |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 12,216,000 |  |
Revenue | $ 796,603,000 | $ 680,022,000 | $ 660,462,000 | $ 670,930,000 | $ 683,042,000 | $ 658,935,000 | $ 617,289,000 | $ 622,625,000 | 2,808,017,000 | 2,581,891,000 | $ 2,367,149,000 |  |
Revenue recognized |  |  |  |  |  |  |  |  | 6,132,000 |  |  |  |
Contract liability, current | 15,162,000 |  |  |  |  |  |  |  | 15,162,000 |  |  |  |
Contract liability, noncurrent | 6,360,000 |  |  |  |  |  |  |  | 6,360,000 |  |  |  |
Contract assets | 38,778,000 |  |  |  | $ 0 |  |  |  | 38,778,000 | $ 0 |  |  |
Anticipated value of right of return assets | 2,667,000 |  |  |  |  |  |  |  | 2,667,000 |  |  |  |
Refund liability | $ 5,153,000 |  |  |  |  |  |  |  | 5,153,000 |  |  |  |
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 |  |  |
Services |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 157,236,000 |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of investment ownership, consolidated | 50.00% |  |  |  |  |  |  |  | 50.00% |  |  |  |
Percentage of investment ownership, equity method | 20.00% |  |  |  |  |  |  |  | 20.00% |  |  |  |
Estimated useful lives of finite-lived assets |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Market share units converted into common stock for each unit | shares |  |  |  |  |  |  |  |  |  | 0 |  |  |
Minimum | Reserve Power Batteries |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Product warranty for a period |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Minimum | Motive Power Batteries |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Product warranty for a period |  |  |  |  |  |  |  |  |  | 1 year |  |  |
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% |  |  |  |  |  |  |  | 50.00% |  |  |  |
Percentage of investment ownership, cost method | 20.00% |  |  |  |  |  |  |  | 20.00% |  |  |  |
Estimated useful lives of finite-lived assets |  |  |  |  |  |  |  |  |  | 20 years |  |  |
Market share units converted into common stock for each unit | shares |  |  |  |  |  |  |  |  |  | 2 |  |  |
Maximum | Reserve Power Batteries |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Product warranty for a period |  |  |  |  |  |  |  |  |  | 20 years |  |  |
Maximum | Motive Power Batteries |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Product warranty for a period |  |  |  |  |  |  |  |  |  | 7 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 |  |  |
Transferred over Time |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized |  |  |  |  |  |  |  |  | $ 100,809,000 |  |  |  |
Accounting Standards Update 2016-02 [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expected lease liability to be recognized |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contract liability, current |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,387,000
Contract liability, noncurrent |  |  |  |  |  |  |  |  |  |  |  |  | 7,094,000
Contract assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 24,810,000

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