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Restructuring Plans - (Additional Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 15 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 03, 2021 | Oct. 04, 2020 | Sep. 30, 2019 | Oct. 04, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Jul. 05, 2020 | Jun. 30, 2020 | Mar. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Expected remaining cost |  | $ 5,500 |  | $ 5,500 |  |  |  |  |
Restructuring and other exit charges |  | 3,119 | $ 6,282 | 4,506 | $ 8,654 |  |  |  |
Employee Severance |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges |  | 1,503 |  | 2,906 |  |  |  |  |
Exit charges |  | 1,616 |  | 1,600 |  |  |  |  |
Restructuring and other exit charges |  | 3,119 |  | 4,506 |  |  |  |  |
Restructuring costs incurred |  |  |  | 4,068 |  |  |  |  |
Energy Systems | Employee Severance |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges |  | 1,331 |  | 1,843 |  |  |  |  |
Exit charges |  | 0 |  | 0 |  |  |  |  |
Restructuring and other exit charges |  | 1,331 |  | 1,843 |  |  |  |  |
Motive Power | Employee Severance |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges |  | 172 |  | 934 |  |  |  |  |
Exit charges |  | 1,509 |  | 1,509 |  |  |  |  |
Restructuring and other exit charges |  | 1,681 |  | 2,443 |  |  |  |  |
Specialty | Employee Severance |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges |  | 0 |  | 129 |  |  |  |  |
Exit charges |  | 107 |  | 91 |  |  |  |  |
Restructuring and other exit charges |  | 107 |  | 220 |  |  |  |  |
Closure Of Facility In Targovishte Bulgaria |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Expected remaining cost |  |  |  |  |  |  |  |  | $ 30,000
Restructuring and other exit charges |  |  |  |  |  | $ 20,242 |  |  |
Richmond Kentucky Battery Formation Area Fire |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring and other exit charges |  | 15,316 |  |  | 17,037 |  |  | $ 32,353 |
Expected additional restructuring charges |  | 45,000 |  | 45,000 |  |  |  |  |
Prepaid Insurance |  | 18,144 |  | $ 18,144 |  |  |  |  | $ 12,000
Restructuring costs incurred |  | 5,156 |  |  | $ 5,000 |  | $ 10,156 | $ 30,144 |
Richmond Kentucky Battery Formation Area Fire | Subsequent Event |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring costs incurred | $ 2,000 |  |  |  |  |  |  |  |
Strategy To Exit Manufacture Of Batteries For Diesel-Electric Submarines |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Proceeds for sale of certain licenses and assets |  | 2,031 |  |  |  |  |  |  |
Gain on sale of assets |  | 892 |  |  |  |  |  |  |
Fixed Asset Write-Off, Kentucky And Tennessee Plants |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring and other exit charges |  | $ 5,441 |  |  |  |  |  |  |

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