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Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill by Business Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Goodwill [Roll Forward] |  |  |  |
Balance at beginning of year |  | $ 663,936 | $ 656,399 |
Acquisitions during the year |  |  | 73,788 |
Measurement period adjustments |  | 2,996 | (1,390) |
Goodwill impairment charge | $ (39,713) | 0 | (39,713) | $ 0
Foreign currency translation adjustment |  | 38,661 | (25,148) |
Balance at end of year | 705,593 | 705,593 | 663,936 | 656,399
Goodwill Reallocation, Adjusted Balance |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance at beginning of year |  | 663,936 |  |
Balance at end of year |  |  | 663,936 |
Energy Systems |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Measurement period adjustments |  | 1,348 |  |
Foreign currency translation adjustment |  | 15,178 |  |
Balance at end of year | 279,676 | 279,676 |  |
Energy Systems | Reallocation to new Reporting Units |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance at beginning of year |  | 263,150 |  |
Balance at end of year |  |  | 263,150 |
Energy Systems | Goodwill Reallocation, Adjusted Balance |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance at beginning of year |  | 263,150 |  |
Balance at end of year |  |  | 263,150 |
Motive Power |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Measurement period adjustments |  | 0 |  |
Foreign currency translation adjustment |  | 18,558 |  |
Balance at end of year | 327,055 | 327,055 |  |
Motive Power | Reallocation to new Reporting Units |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance at beginning of year |  | 308,497 |  |
Balance at end of year |  |  | 308,497 |
Motive Power | Goodwill Reallocation, Adjusted Balance |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance at beginning of year |  | 308,497 |  |
Balance at end of year |  |  | 308,497 |
Specialty |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Measurement period adjustments |  | 1,648 |  |
Foreign currency translation adjustment |  | 4,925 |  |
Balance at end of year | 98,862 | 98,862 |  |
Specialty | Reallocation to new Reporting Units |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance at beginning of year |  | 92,289 |  |
Balance at end of year |  |  | 92,289 |
Specialty | Goodwill Reallocation, Adjusted Balance |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance at beginning of year |  | 92,289 |  |
Balance at end of year |  |  | 92,289 |
Americas |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance at beginning of year |  | 524,156 | 470,194 |
Acquisitions during the year |  |  | 72,056 |
Measurement period adjustments |  |  | (1,390) |
Foreign currency translation adjustment |  |  | (16,704) |
Balance at end of year | 0 | 0 | 524,156 | 470,194
Accumulated impairment charges |  |  | 57,845 |
Americas | Reallocation to new Reporting Units |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance at beginning of year |  | (524,156) |  |
Balance at end of year |  |  | (524,156) |
Americas | Goodwill Reallocation, Adjusted Balance |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance at beginning of year |  | 0 |  |
Balance at end of year |  |  | 0 |
EMEA |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance at beginning of year |  | 139,780 | 143,269 |
Acquisitions during the year |  |  | 1,732 |
Foreign currency translation adjustment |  |  | (5,221) |
Balance at end of year | 0 | 0 | 139,780 | 143,269
EMEA | Reallocation to new Reporting Units |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance at beginning of year |  | (139,780) |  |
Balance at end of year |  |  | (139,780) |
EMEA | Goodwill Reallocation, Adjusted Balance |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance at beginning of year |  | 0 |  |
Balance at end of year |  |  | 0 |
Asia |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance at beginning of year |  | 0 | 42,936 |
Goodwill impairment charge |  |  | (39,713) |
Foreign currency translation adjustment |  |  | (3,223) |
Balance at end of year | $ 0 | 0 | 0 | $ 42,936
Accumulated impairment charges |  |  | 44,892 |
Asia | Goodwill Reallocation, Adjusted Balance |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance at beginning of year |  | $ 0 |  |
Balance at end of year |  |  | $ 0 |

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