Foreign Currency Exchange Contracts and Hedging (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		6 Months Ended					3 Months Ended	6 Months Ended
	Sep. 30, 2014	Mar. 31, 2014 counterparty	Sep. 30, 2014 Foreign currency exchange contracts	Sep. 30, 2014 Derivatives designated as cash flow hedges Foreign currency exchange contracts	Sep. 30, 2013 Derivatives designated as cash flow hedges Foreign currency exchange contracts	Mar. 31, 2014 Designated as Hedging Instrument Foreign currency exchange contracts	Sep. 30, 2014 Designated as Hedging Instrument Derivatives designated as cash flow hedges Foreign currency exchange contracts counterparty	Jun. 30, 2013 Non-designated derivatives Foreign currency exchange contracts	Sep. 30, 2014 Non-designated derivatives Foreign currency exchange contracts counterparty
Foreign currency exchange contracts and hedging
Derivative notional amount						$ 64,000	$ 39,000		$ 45,000
Number of counterparties in derivative contracts		4					3		3
Remaining maturity of outstanding foreign currency forward contracts, maximum			3 months
Estimate of time to transfer	6 months
Summary of the effect of derivative instruments on the consolidated statements of income
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)				1,625	(2,583)			(32)	3,433
Reclassified from AOCI into Income (Effective Portion)				(299)	597
Gain (Loss) from Amount Excluded from Effectiveness Testing				$ (70)	$ 21