Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Foreign Exchange Contracts by Currency (Details)

v3.8.0.1
Fair Value Measurements - Foreign Exchange Contracts by Currency (Details) - Foreign Exchange Forward Contracts [Member] - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Derivative [Line Items]      
Gain (loss) on realized on foreign currency related to forward contracts $ (96) $ (453) $ (411)
Notional amount 18,716 2,375  
Russian Rubles [Member]      
Derivative [Line Items]      
Notional amount 2,416 250  
Euro [Member]      
Derivative [Line Items]      
Notional amount 750 0  
Canada, Dollars      
Derivative [Line Items]      
Notional amount 4,000 0  
South Korean Won [Member]      
Derivative [Line Items]      
Notional amount 10,500 1,300  
Mexico, Pesos      
Derivative [Line Items]      
Notional amount 200 450  
Australia, Dollars      
Derivative [Line Items]      
Notional amount $ 850 $ 375