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Net Income (Loss) Per Share (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended			1 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jul. 14, 2011 Warrants	Jul. 31, 2011 Convertible Debt	Jul. 14, 2011 Convertible Debt
Antidilutive Securities Excluded from Computation of Net Income Per Share
Antidilutive securities excluded from computation of net income per share	4		4
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	6	0	8	0
Contractual interest rate of 0.75% Convertible Senior Notes due 2016							0.75%
Convertible Senior Notes due description						2016
Conversion price per share							$ 31.74
Warrants, Conversion price per share					$ 41.14