Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Stockholders' Equity Note [Abstract]
Unrealized gain on cash flow hedges	$ 4,369	$ 243
Cumulative foreign currency translation loss	(24,550)	(13,226)
Total	$ (20,181)	$ (12,983)

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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