Financial Instruments (Details 4)	12 Months Ended																12 Months Ended										12 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Mar. 31, 2014 Cost of Goods Sold USD ($)	Mar. 31, 2013 Cost of Goods Sold USD ($)	Mar. 31, 2012 Cost of Goods Sold USD ($)	Mar. 31, 2014 Other Income (Expense), Net USD ($)	Mar. 31, 2013 Other Income (Expense), Net USD ($)	Mar. 31, 2012 Other Income (Expense), Net USD ($)	Mar. 31, 2014 Designated as hedging instruments: Cash Flow Hedges USD ($)	Mar. 31, 2013 Designated as hedging instruments: Cash Flow Hedges USD ($)	Mar. 31, 2012 Designated as hedging instruments: Cash Flow Hedges USD ($)	Mar. 31, 2014 Designated as hedging instruments: Cash Flow Hedges Foreign exchange forward contract USD ($) item	Mar. 31, 2014 Designated as hedging instruments: Cash Flow Hedges Foreign exchange forward contract EUR (€) item	Mar. 31, 2013 Designated as hedging instruments: Cash Flow Hedges Foreign exchange forward contract USD ($)	Mar. 31, 2013 Designated as hedging instruments: Cash Flow Hedges Foreign exchange forward contract EUR (€)	Mar. 31, 2014 Designated as hedging instruments: Cash Flow Hedges Cost of Goods Sold USD ($)	Mar. 31, 2013 Designated as hedging instruments: Cash Flow Hedges Cost of Goods Sold USD ($)	Mar. 31, 2012 Designated as hedging instruments: Cash Flow Hedges Cost of Goods Sold USD ($)	Mar. 31, 2014 Designated as hedging instruments: Cash Flow Hedges Other Income (Expense), Net USD ($)	Mar. 31, 2013 Designated as hedging instruments: Cash Flow Hedges Other Income (Expense), Net USD ($)	Mar. 31, 2012 Designated as hedging instruments: Cash Flow Hedges Other Income (Expense), Net USD ($)	Mar. 31, 2014 Not designated as hedging instruments: Foreign exchange forward contract USD ($)	Mar. 31, 2013 Not designated as hedging instruments: Foreign exchange forward contract USD ($)	Mar. 31, 2014 Not designated as hedging instruments: Foreign exchange swap contract USD ($)	Mar. 31, 2013 Not designated as hedging instruments: Foreign exchange swap contract USD ($)	Mar. 31, 2014 Not designated as hedging instruments: Other Income (Expense), Net USD ($)	Mar. 31, 2013 Not designated as hedging instruments: Other Income (Expense), Net USD ($)	Mar. 31, 2012 Not designated as hedging instruments: Other Income (Expense), Net USD ($)	Mar. 31, 2014 Not designated as hedging instruments: Other Income (Expense), Net Foreign exchange forward contract USD ($)	Mar. 31, 2013 Not designated as hedging instruments: Other Income (Expense), Net Foreign exchange forward contract USD ($)	Mar. 31, 2012 Not designated as hedging instruments: Other Income (Expense), Net Foreign exchange forward contract USD ($)	Mar. 31, 2014 Not designated as hedging instruments: Other Income (Expense), Net Foreign exchange swap contract USD ($)	Mar. 31, 2013 Not designated as hedging instruments: Other Income (Expense), Net Foreign exchange swap contract USD ($)	Mar. 31, 2012 Not designated as hedging instruments: Other Income (Expense), Net Foreign exchange swap contract USD ($)
Amounts of gains and losses on the derivative instruments
Amount of Gain (Loss) Deferred as a Component of Accumulated Other Comprehensive Loss	$ (1,025,000)	$ 566,000	$ 2,916,000							$ (1,025,000)	$ 566,000	$ 2,916,000
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss				2,472,000	1,756,000	(421,000)											2,472,000	1,756,000	(421,000)
Amount of Gain (Loss) Immediately Recognized							698,000	603,000	(2,432,000)											(126,000)	275,000	(198,000)					824,000	328,000	(2,234,000)	(464,000)	(848,000)	(350,000)	1,288,000	1,176,000	(1,884,000)
Number of entity with euro functional currency that purchases in U.S. dollars													1	1
Average maturity													4 months	4 months
Notional amounts of foreign exchange forward contracts outstanding													$ 51,800,000	€ 37,600,000	$ 38,500,000	€ 30,100,000							$ 23,200,000	$ 14,200,000	$ 30,500,000	$ 19,600,000