CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 68,392	$ 112,301	$ 112,417
Other comprehensive income (loss):
Foreign currency translation adjustments	376	476	(244)
Unrealized gains (losses) on cash flow hedges:
Unrealized cash flow hedge gains (losses) arising during the year	(3,786)	10,348	(3,750)
Net (gains) losses reclassified into net revenues for revenue hedges (effective portion)	(7,826)	(3,650)	965
Net (gains) losses reclassified into cost of revenues for cost of revenues hedges (effective portion)	4,801	449	(28)
Net unrealized gains (losses) on cash flow hedges	(6,811)	7,147	(2,813)
Unrealized holding gains (losses) during the year	(67)	2	101
Aggregate income tax benefit (expense) of the above items	141	(143)	27
Other comprehensive income (loss)	(6,361)	7,482	(2,929)
Comprehensive income	$ 62,031	$ 119,783	$ 109,488