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Restructuring Plans - (Additional Information) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 03, 2021 USD ($) | Jul. 04, 2021 USD ($) | Oct. 04, 2020 USD ($) | Oct. 03, 2021 USD ($) | Oct. 04, 2020 USD ($) | Mar. 31, 2021 USD ($) Employee | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected remaining cost | $ 2,447 |  |  | $ 2,447 |  |  |  |
Restructuring and other exit charges | 2,857 |  | $ 3,119 | 10,689 | $ 4,506 |  |  |
Inventory adjustment relating to exit activities | 960 |  | $ 0 | 960 | 0 |  |  |
Proceeds from disposal of facility |  |  |  | 3,268 | $ 0 |  |  |
Employee Severance |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges | 1,013 |  |  | 2,339 |  |  |  |
Exit charges | 1,844 |  |  | 8,350 |  |  |  |
Restructuring and other exit charges | 2,857 |  |  | 10,689 |  |  |  |
Restructuring costs incurred |  |  |  | 3,400 |  |  |  |
Employee Severance | Energy Systems |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges | 161 |  |  | 1,019 |  |  |  |
Exit charges | 0 |  |  | (370) |  |  |  |
Restructuring and other exit charges | 161 |  |  | 649 |  |  |  |
Employee Severance | Motive Power |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges | 849 |  |  | 1,281 |  |  |  |
Exit charges | 1,827 |  |  | 9,928 |  |  |  |
Restructuring and other exit charges | 2,676 |  |  | 11,209 |  |  |  |
Employee Severance | Specialty |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges | 3 |  |  | 39 |  |  |  |
Exit charges | 17 |  |  | (1,208) |  |  |  |
Restructuring and other exit charges | 20 |  |  | (1,169) |  |  |  |
Closure of Facility in Hagen, Germany |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected additional restructuring charges | 60,000 |  |  | 60,000 |  |  |  |
Estimated number of positions eliminated | Employee |  |  |  |  |  | 200 |  |
Inventory adjustment relating to exit activities |  |  |  | 960 |  |  |  |
Closure of Facility in Hagen, Germany | Cash charges |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected additional restructuring charges | 40,000 |  |  | 40,000 |  |  |  |
Closure of Facility in Hagen, Germany | Severance, Cash Charges |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | $ 23,331 |  |
Closure of Facility in Hagen, Germany | Non Cash Charges |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected additional restructuring charges | 20,000 |  |  | 20,000 |  |  |  |
Closure of Facility in Hagen, Germany | Severance, Non Cash Charges |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  | 3,635 |  | 7,946 |  |
Closure of Facility in Hagen, Germany | Employee Severance |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  | 6,663 |  |  |  |
Closure Of Facility In Targovishte Bulgaria |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected remaining cost |  |  |  |  |  |  |  | $ 26,000
Restructuring and other exit charges |  |  |  |  |  | 220 | $ 5,123 | $ 20,242
Proceeds from disposal of facility |  |  |  | 1,489 |  |  |  |
Gain on disposal of facility |  |  |  | 1,208 |  |  |  |
Closure of Facility in Samudio, Spain |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Gain on disposal of facility |  | $ 1,779 |  |  |  |  |  |
Proceeds for sale of certain licenses and assets |  | $ 740 |  |  |  |  |  |
Richmond Kentucky Battery Formation Area Fire |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Prepaid Insurance | $ 18,144 |  |  | 18,144 |  |  |  |
Richmond Kentucky Battery Formation Area Fire | Cleanup |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and other exit charges |  |  |  | 15,316 |  |  |  |
Richmond Kentucky Battery Formation Area Fire | Business Interruption |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring costs incurred |  |  |  | $ 5,156 |  |  |  |
Closure Of Facility In Vijayawada India |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Exit charges |  |  |  |  |  | $ 1,509 |  |

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