Derivative Financial Instruments - Location and Amounts of Derivative Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017
Derivatives and Hedging Activities Designated as Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	$ 47	$ 1,174
Derivatives and Hedging Activities Designated as Cash Flow Hedges | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, fair value	280	0
Derivatives and Hedging Activities Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	14	0
Derivatives and Hedging Activities Not Designated as Hedging Instruments | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, fair value	0	324
Lead forward contracts | Derivatives and Hedging Activities Designated as Cash Flow Hedges | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	47	1,163
Lead forward contracts | Derivatives and Hedging Activities Not Designated as Hedging Instruments | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	0	0
Foreign currency forward contracts | Derivatives and Hedging Activities Designated as Cash Flow Hedges | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	0	11
Foreign currency forward contracts | Derivatives and Hedging Activities Designated as Cash Flow Hedges | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, fair value	280	0
Foreign currency forward contracts | Derivatives and Hedging Activities Not Designated as Hedging Instruments | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	14	0
Foreign currency forward contracts | Derivatives and Hedging Activities Not Designated as Hedging Instruments | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, fair value	$ 0	$ 324