Derivative Financial Instruments - Additional Information (Details) - Designated as Hedging Instrument [Member] - Foreign Exchange Forward [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative [Line Items]
Realized gain (loss) from foreign currency forward contracts	$ (13)	$ 12	$ (32)	$ 14
Notional amount of derivative contracts	1,105	1,564	1,105	1,564
Foreign currency forward contracts, unrealized gain (loss)	$ (46)	$ 14	$ (46)	$ 14