CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 34,383	$ 28,206	$ 84,474	$ 77,693
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(73)	61	(114)	(58)
Unrealized cash flow hedge gains (losses) arising during the period	(218)	(944)	(3,794)	590
Net (gains) losses reclassified into income for revenue hedges	114	(262)	258	(3,281)
Net (gains) losses reclassified into income for cost of revenue hedges	63	(399)	(176)	(109)
Net unrealized losses on cash flow hedges	(41)	(1,605)	(3,712)	(2,800)
Unrealized holding gains (losses) during the period	(1)	(33)	5	25
Other comprehensive loss	(115)	(1,577)	(3,821)	(2,833)
Comprehensive income	$ 34,268	$ 26,629	$ 80,653	$ 74,860