Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Foreign Exchange Contracts (Details)

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Fair Value Measurements - Foreign Exchange Contracts (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Maximum term of forward contracts     30 days    
Net Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments $ (339) $ (135) $ (263) $ 0  
Foreign Exchange Forward Contracts          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Foreign exchange contract forwards, assets 53   53   $ 229
Foreign exchange contract forwards, liabilities 12   12   $ 25
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net $ (70) $ (85) $ 0 $ 0