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		9 Months Ended						1 Months Ended	9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2012	Dec. 31, 2012 Warrants	Jul. 14, 2011 Warrants	Dec. 31, 2012 0.75% Convertible Senior Notes	Jul. 31, 2011 0.75% Convertible Senior Notes Due 2016	Dec. 31, 2012 0.75% Convertible Senior Notes Due 2016	Jul. 14, 2011 0.75% Convertible Senior Notes Due 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from net income per share	4	6	2	7
Contractual interest rate of 0.75% Convertible Senior Notes due 2016	0.75%		0.75%		0.75%					0.75%	0.75%
Convertible Senior Notes due description									2016	2016
Conversion price per share								$ 31.74			$ 31.74
Warrants, Conversion price per share						41.14	41.14