CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (135,561)	$ (869)	$ 82,599
Other comprehensive income (loss):
Foreign currency translation adjustment	150	257	(311)
Unrealized gains (losses) on cash flow hedges:
Unrealized cash flow hedge gains (losses) arising during the year	(4,176)	(6,741)	3,095
Net (gains) losses reclassified into net revenues for revenue hedges (effective portion)	(4,034)	4,715	(4,111)
Net (gains) losses reclassified into cost of revenues for cost of revenues hedges (effective portion)	(177)	(208)	2,663
Net (gains) losses reclassified into income for interest rate swap hedges	2,600	0	0
Net unrealized gains (losses) on cash flow hedges	(5,787)	(2,234)	1,647
Unrealized holding gains (losses) during the year	198	48	(516)
Aggregate income tax benefit of the above items	2,095	105	115
Other comprehensive income (loss)	(3,344)	(1,824)	935
Comprehensive income (loss)	$ (138,905)	$ (2,693)	$ 83,534