CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Net income	$ 26,953	$ 23,563
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(352)	(336)
Unrealized cash flow hedge gains (losses) arising during the period	(1,627)	2,166
Net (gains) losses reclassified into income for revenue hedges	16	(1,861)
Net (gains) losses reclassified into income for cost of revenues hedges	(265)	197
Net unrealized gains (losses) on cash flow hedges	(1,876)	502
Unrealized holding gains (losses) during the period	(158)	12
Other comprehensive income (loss)	(2,386)	178
Comprehensive income	$ 24,567	$ 23,741