Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013
Loss Contingencies [Line Items]
Amount of potential cash payments that could result from unrecognized tax benefits	$ 263
Maximum potential payout of acquisition-related contingent consideration	560	566
Accrued contingent consideration	2
Compensatory Damages [Member]
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss	3.5
Prejudgment Interest [Member]
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss	8.0
Pecover [Member]
Loss Contingencies [Line Items]
Estimated litigation liability	27
Collegiate Licensing Company [Member]
Loss Contingencies [Line Items]
Estimated litigation liability	$ 30