CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statement (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 112,417	$ 106,402	$ 109,036
Other comprehensive income:
Foreign currency translation adjustments	(244)	(261)	(788)
Unrealized cash flow hedge gains (losses) arising during the year	(3,750)	3,441	2,951
Net (gains) losses reclassified into net revenues for revenue hedges (effective portion)	965	(3,367)	2,415
Net (gains) losses reclassified into cost of revenues for cost of revenues hedges (effective portion)	(28)	(640)	385
Net unrealized gains (losses) on cash flow hedges	(2,813)	(566)	5,751
Unrealized holding gains during the year	101	35	68
Net losses reclassified into income	0	0	(11)
Net unrealized gains on investments	101	35	57
Aggregate income tax benefit (expense) of the above items	27	2	(136)
Other comprehensive income (loss)	(2,929)	(790)	4,884
Comprehensive income	$ 109,488	$ 105,612	$ 113,920