Income Taxes Reconciliation of Unrecognized Gross Tax Benefits (Details 9) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Reconciliation of Gross Tax Benefits [Line Items]
Unrecognized Tax Benefits	$ 77,892	$ 72,650	$ 90,831	$ 77,653
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	5,659	11,726	9,822
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	12,610	8,439	10,668
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	(138)	(13,083)	(3,575)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	(12,889)	(25,205)	(3,185)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	$ 0	$ (58)	$ (552)