Foreign Currency Exchange Contracts and Hedging (Narrative) (Details) $ in Thousands	1 Months Ended	3 Months Ended	8 Months Ended	9 Months Ended
	Feb. 09, 2016 USD ($) counterparty	Dec. 31, 2015 USD ($) counterparty	Dec. 31, 2015 USD ($) counterparty	Dec. 31, 2015 USD ($) counterparty	Dec. 31, 2014 USD ($)	Mar. 31, 2015 USD ($) counterparty
Foreign currency exchange contracts and hedging
Number of counterparties in derivative contracts | counterparty						4
Remaining maturity of foreign currency derivatives (in months)				15 months
Derivatives designated as cash flow hedges | Foreign currency exchange contracts
Summary of the effect of derivative instruments on the consolidated statements of income
Amount of (loss) gain recognized in other comprehensive income on derivatives (effective portion)				$ (106)	$ 2,053
Amount of (loss) gain reclassified from accumulated other comprehensive income into income (effective portion)				(1,686)	1,226
Amount of gain (loss) excluded from effectiveness testing				34	(79)
Designated as hedging instrument | Foreign currency exchange contracts
Foreign currency exchange contracts and hedging
Derivative notional amount		$ 118,000	$ 118,000	$ 118,000		$ 46,000
Number of counterparties in derivative contracts | counterparty		7	7	7
Derivative, settled during period, notional amount		$ 35,000	$ 65,000
Non-designated derivatives | Foreign currency exchange contracts
Foreign currency exchange contracts and hedging
Derivative, entered into and settled during period, notional amount		91,000		$ 196,000
Summary of the effect of derivative instruments on the consolidated statements of income
Amount of gain recognized in income on derivatives				553	$ 5,909
Non-designated derivatives | Foreign currency exchange contracts | Subsequent event
Foreign currency exchange contracts and hedging
Derivative notional amount	$ 44,000
Number of counterparties in derivative contracts | counterparty	7
Remaining maturity of foreign currency derivatives (in months)	3 months
Other current assets and other accrued expenses | Designated as hedging instrument | Foreign currency exchange contracts
Foreign currency exchange contracts and hedging
Derivative notional amount		101,000	101,000	101,000
Other assets and other long-term liabilities | Designated as hedging instrument | Foreign currency exchange contracts
Foreign currency exchange contracts and hedging
Derivative notional amount		$ 17,000	$ 17,000	$ 17,000