Summary Of Accounting Policies (Schedule Of Estimated Future Annual Amortization Expense For Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2011
Summary Of Accounting Policies [Abstract]
2012	$ 9,266	[1]
2013	31,414
2014	21,150
2015	11,139
2016	5,805
Thereafter	4,545
Total amortization expense	$ 83,319

[1] Represents estimated amortization for the three-month period ending March 31, 2012.