Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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+ Details

Net Loss Per Share (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended					6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2012	Sep. 30, 2012 Warrants	Jul. 14, 2011 Warrants	Sep. 30, 2012 0.75% Convertible Senior Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from net income per share	2	6	2	7
Contractual interest rate of 0.75% Convertible Senior Notes due 2016	0.75%		0.75%		0.75%			0.75%
Convertible Senior Notes due								2016
Conversion price per share								$ 31.74
Warrants, Conversion price per share						41.14	41.14