Foreign Currency Exchange Contracts and Hedging (Details)	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 09, 2018 USD ($) counterparty	Dec. 31, 2017 USD ($) counterparty	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) counterparty	Dec. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)
Foreign currency exchange contracts and hedging
Gain (loss) reclassification from AOCI to income, estimate of time to transfer				6 months
Foreign currency exchange contracts
Foreign currency exchange contracts and hedging
Notional value		$ 62,549,000		$ 62,549,000
Designated as Hedging Instrument | Foreign currency exchange contracts
Foreign currency exchange contracts and hedging
Number of counterparties in derivative contracts | counterparty		2		2
Maximum remaining maturity of foreign currency derivatives				3 months
Derivative, settled during period, notional amount		$ 50,997,000		$ 83,807,000
Derivative, entered into and settled during period, notional amount				13,471,000
Designated as Hedging Instrument | Derivatives designated as cash flow hedges
Summary of the effect of derivative instruments on the consolidated statements of income
Amount of (loss) gain reclassified from accumulated other comprehensive loss into income (effective portion)		(3,914,000)	$ 4,294,000	(6,197,000)	$ 5,970,000
Amount of gain excluded from effectiveness testing		273,000	142,000	1,045,000	497,000
Designated as Hedging Instrument | 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 gain recognized in other comprehensive income (loss) on derivative instruments (effective portion)		$ 108,000	2,054,000	$ (9,682,000)	6,957,000
Not Designated as Hedging Instrument | Foreign currency exchange contracts
Foreign currency exchange contracts and hedging
Number of counterparties in derivative contracts | counterparty		5		5
Maximum remaining maturity of foreign currency derivatives				3 months
Derivative, entered into and settled during period, notional amount				$ 42,344,000
Summary of the effect of derivative instruments on the consolidated statements of income
Amount of gain recognized in income on derivative instruments		$ 211,000	$ 4,038,000	(2,455,000)	$ 3,157,000
Subsequent Event | Foreign currency exchange contracts
Foreign currency exchange contracts and hedging
Number of counterparties in derivative contracts | counterparty	6
Subsequent Event | Designated as Hedging Instrument | Derivatives designated as cash flow hedges | Foreign currency exchange contracts
Foreign currency exchange contracts and hedging
Notional value	$ 90,091,000
Subsequent Event | Not Designated as Hedging Instrument | Foreign currency exchange contracts
Foreign currency exchange contracts and hedging
Notional value	$ 0
Maximum remaining maturity of foreign currency derivatives	15 months
Fair Value, Measurements, Recurring | Designated as Hedging Instrument
Foreign currency exchange contracts and hedging
Fair value recorded in other current assets						$ 1,365,000
Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Derivatives designated as cash flow hedges
Foreign currency exchange contracts and hedging
Fair value recorded in other accrued expenses		(1,827,000)		(1,827,000)
Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Derivatives designated as cash flow hedges | Foreign currency exchange contracts
Foreign currency exchange contracts and hedging
Notional value		24,347,000		24,347,000
Fair value recorded in other current assets		0		0
Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument
Foreign currency exchange contracts and hedging
Fair value recorded in other current assets		130,000		130,000
Fair value recorded in other accrued expenses		(394,000)		(394,000)
Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument | Foreign currency exchange contracts
Foreign currency exchange contracts and hedging
Notional value		$ 38,202,000		$ 38,202,000