Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Net income	$ 40,609	$ 32,428	$ 37,265
Other comprehensive income:
Unrealized gains on cash equivalents, marketable securities and restricted investment, net of taxes of $73, $810 and $623	109	1,357	936
Unrealized gain (loss) on hedge contracts, net of (benefits) taxes of ($55), ($51), and $128	(110)	(84)	205
Cumulative translation adjustments	460	(385)	0
Other comprehensive income	459	888	1,141
Comprehensive income	$ 41,068	$ 33,316	$ 38,406