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Restructuring Plans - (Additional Information) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) Employee | Oct. 01, 2017 USD ($) | Sep. 30, 2018 USD ($) | Oct. 01, 2017 USD ($) | Mar. 31, 2018 USD ($) Employee | Mar. 31, 2017 USD ($) Employee
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Write-off of assets relating to exit activities |  |  | $ 1,073 | $ 210 |  |
Restructuring and other exit (credits) | $ 1,121 | $ 1,776 | 2,860 | $ 2,609 |  |
Restructuring costs incurred |  |  | 2,243 |  |  |
Restructuring reserve | 2,835 |  | 2,835 |  | $ 2,909 |
EMEA | Restructurings Related to Improving Efficiency Related to Motive Power Assembly and Distribution Center |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Write-off of assets relating to exit activities |  |  |  |  |  | $ 4,700
Expected reduction in number of employees | Employee |  |  |  |  |  | 45
Restructuring and other exit (credits) |  |  |  |  | 1,610 | $ 3,104
Restructuring costs incurred |  |  | 1,021 |  | 2,403 | $ 749
Restructuring reserve | 675 |  | 675 |  |  |
EMEA | Restructurings Related to Improving Efficiency Related to Supply Chain and General Operations |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Write-off of assets relating to exit activities |  |  |  |  | $ 7,700 |
Expected reduction in number of employees | Employee |  |  |  |  | 75 |
Restructuring and other exit (credits) |  |  | 2,176 |  |  |
Restructuring costs incurred |  |  | 879 |  | $ 1,350 |
Restructuring reserve | 2,159 |  | 2,159 |  |  |
Expected additional restructuring charges | 3,100 |  | 3,100 |  |  |
EMEA | Restructurings Related to Improving Efficiency Related to Supply Chain and General Operations | Non-cash charges |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other exit (credits) |  |  |  |  | 69 |
EMEA | Restructurings Related to Improving Efficiency Related to Supply Chain and General Operations | Cash charges |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other exit (credits) |  |  |  |  | 2,260 |
EMEA | Restructurings Related to Improving Efficiencies of Reserve Power Operations in EMEA |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Write-off of assets relating to exit activities |  |  | 200 |  |  |
Restructuring and other exit (credits) |  |  | 23 |  |  |
Restructuring costs incurred |  |  | 22 |  |  |
Restructuring reserve | 1 |  | 1 |  |  |
Americas | Restructurings Related to Improving Efficiencies of General Operations in the Americas |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Write-off of assets relating to exit activities | $ 960 |  |  |  |  |
Expected reduction in number of employees | Employee | 60 |  |  |  |  |
Restructuring and other exit (credits) |  |  |  |  | 960 |
Restructuring costs incurred |  |  | 207 |  | $ 755 |
Asia | Restructuring Related to Improving Profitability in India |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Write-off of assets relating to exit activities |  |  | 547 |  |  |
Restructuring and other exit (credits) |  |  | 114 |  |  |
Cost of Sales | Asia | Restructuring Related to Improving Profitability in India | Non-cash charges |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other exit (credits) |  |  | $ 526 |  |  |

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