CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Net income	$ 395,281	$ 127,389	$ 336,705
Unrealized holding (losses) gain, net of tax effect of $497, $557 and ($339), respectively	(4,377)	2,686	(41)
Reclassification of realized transactions, net of tax effect of $776, $51 and ($58), respectively	(1,595)	(343)	(215)
Change in minimum pension liability, net of tax effect of $55 and $28, respectively	88	52	0
Change in net foreign currency translation adjustment	0	1,439	0
Other comprehensive (loss) income, net of taxes	(5,884)	3,834	(256)
Total comprehensive income	$ 389,397	$ 131,223	$ 336,449