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Restructuring Plans - (Additional Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 15 Months Ended |
--- | --- | --- | --- | ---
Jul. 05, 2020 | Jun. 30, 2019 | Sep. 30, 2019 | Jul. 05, 2020 | Jun. 30, 2020 | Mar. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected remaining cost | $ 6,500 |  |  | $ 6,500 |  |
Restructuring charges | 1,387 | $ 2,372 |  |  |  |
Employee Severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | 1,403 |  |  |  |  |
Restructuring costs incurred | 1,291 |  |  |  |  |
Energy Systems |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | 512 | 1,110 |  |  |  |
Energy Systems | Employee Severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | 507 |  |  |  |  |
Motive Power |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | 762 | 558 |  |  |  |
Motive Power | Employee Severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | 762 |  |  |  |  |
Specialty |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | 113 | 704 |  |  |  |
Specialty | Employee Severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | 134 |  |  |  |  |
Closure Of Facility In Targovishte Bulgaria |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected remaining cost |  |  |  |  |  | $ 30,000
Restructuring charges |  |  | $ 20,242 |  |  |
Richmond Kentucky Battery Formation Area Fire |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | 9,274 | 17,037 |  |  | $ 26,311 |
Expected additional restructuring charges | 50,000 |  |  | 50,000 |  |
Prepaid Insurance | 10,000 |  |  | 10,000 |  | $ 12,000
Restructuring costs incurred | $ 3,700 | $ 5,000 |  | $ 8,700 | $ 22,000 |

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