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Forward and Swap Contracts (Details) $ in Thousands, $ in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2019 USD ($) lbs	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2019 CAD ($) lbs	Mar. 31, 2019 MXN ($) lbs
Derivative [Line Items]
Non-derivative Net Investment Hedge	$ 51,916
Other Assets
Derivative [Line Items]
Derivative Assets	552	$ 187
Derivative Liabilities	0	0
Accrued Liabilities
Derivative [Line Items]
Derivative Assets	0	0
Derivative Liabilities	278	0
Selling, General and Administrative Expenses
Derivative [Line Items]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	235	(1,357)	$ (1,886)
Cost of Sales
Derivative [Line Items]
Gain (Loss) on Sale of Commodity Contracts	$ 434	$ 373	$ 376
Mexico, Pesos
Derivative [Line Items]
Notional Amount of Foreign Currency Derivative Purchase Contracts (Deprecated 2013-01-31)					$ 150,000
Canada, Dollars
Derivative [Line Items]
Notional Amount of Foreign Currency Derivative Purchase Contracts (Deprecated 2013-01-31)				$ 9,000
212230 Copper, Nickel, Lead, and Zinc Mining [Member]
Derivative [Line Items]
Investment Contract Weight | lbs	652,900			652,900	652,900

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The weight of a commodity or material specified in an investment contract. For this element, weight may be specified using units of weight (such as pounds) or units of mass (such as kilograms) since in commercial practice, the term 'weight' tends to be interchangeable with 'mass'.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments.

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The difference between the book value and the sale price of agreements to purchase or sell mineral resources, energy, and agricultural products at some future point. This element refers to the gain (loss) included in earnings and not to the cash proceeds.

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