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	$ 127,389	$ 336,705	$ 418,950
Change in net unrealized holding gain (loss) on available-for-sale securities, net of tax effect of ($505), $281 and ($493), respcetively	2,343	(256)	325
Change in minimum pension liability, net of tax effect of ($28)	52	0	0
Change in net foreign currency translation adjustment	1,439	0	0
Other comprehensive income (loss)	3,834	(256)	325
Total comprehensive income	$ 131,223	$ 336,449	$ 419,275