Stockholders' Equity - Restricted Stock Units (Details) (USD $)	12 Months Ended				12 Months Ended			1 Months Ended		12 Months Ended			1 Months Ended	12 Months Ended			1 Months Ended			12 Months Ended	1 Months Ended													1 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2014 Restricted Stock Units (RSUs)	Mar. 31, 2013 Restricted Stock Units (RSUs)	Mar. 31, 2012 Restricted Stock Units (RSUs)	May 31, 2012 Performance-Based RSU	Feb. 29, 2012 Performance-Based RSU milestone	Mar. 31, 2014 Restricted Stock	Mar. 31, 2013 Restricted Stock	Mar. 31, 2012 Restricted Stock	Nov. 30, 2013 Performance-Based MSU	Mar. 31, 2014 RSU plan prior to May 2006 Restricted Stock Units (RSUs)	Mar. 31, 2014 RSU plan post May 2006	Mar. 31, 2014 RSU plan post May 2006 Restricted Stock Units (RSUs) quarter	Apr. 30, 2011 April 2011 Plan Performance-Based RSU	Feb. 29, 2012 November 2011 and February 2012 Plan Performance-Based RSU	Nov. 30, 2011 November 2011 and February 2012 Plan Performance-Based RSU	Mar. 31, 2014 FY2014 Short Term Plan	May 31, 2012 Minimum Performance-Based RSU	Nov. 30, 2013 Minimum Performance-Based MSU	Feb. 29, 2012 Minimum November 2011 and February 2012 Plan Restricted Stock Units (RSUs)	Nov. 30, 2011 Minimum November 2011 and February 2012 Plan Restricted Stock Units (RSUs)	May 31, 2013 Minimum FY2014 Short Term Plan	Nov. 30, 2013 Maximum Performance-Based MSU	Feb. 29, 2012 Maximum November 2011 and February 2012 Plan Restricted Stock Units (RSUs)	Nov. 30, 2011 Maximum November 2011 and February 2012 Plan Restricted Stock Units (RSUs)	May 31, 2013 Maximum FY2014 Short Term Plan	Feb. 29, 2012 Officer	Nov. 30, 2013 Officer Performance-Based RSU	Feb. 29, 2012 Officer Performance-Based RSU	Mar. 31, 2014 Officer Performance-Based RSU	May 31, 2013 First Vesting Period Performance-Based MSU	May 31, 2012 First Vesting Period November 2011 and February 2012 Plan	May 31, 2013 Second Vesting Period Performance-Based MSU	May 31, 2012 Second Vesting Period November 2011 and February 2012 Plan
Class of Stock [Line Items]
RSU share vesting period																																			66.67%		33.33%
Weighted average remaining contractual term for the restricted stock units outstanding, in years	10 months 12 days
Vesting period, in years								12 months						4 years		4 years	3 years	18 months	18 months		1 year		1 year	1 year			18 months	18 months
Schedule of Restricted Stock Unit Activity
Outstanding at the beginning of the year										6,444,000	9,244,000	3,074,000
Awarded during the year										3,594,000	1,040,000	8,833,000																			500,000
Vested during the year										(2,397,000)	(2,345,000)	(1,701,000)																			(200,000)
Cancelled during the year										(1,536,000)	(1,495,000)	(962,000)
Outstanding at the end of the year					6,105,000					6,105,000	6,444,000	9,244,000
Number of shares vested															0
Award vesting period, quarters																12
Awards granted	40,000	40,000	250,000																													500,000
Number of milestones									3
Value of stock options awarded																														$ 3,700,000
Options granted and outstanding	2,409,000	3,492,000	4,164,000	5,390,000																													300,000
Fair value													3,100,000																		3,300,000
Performance period																																		2 years		3 years
Award vesting percentage per year																						0.00%				150.00%
Award pay out percentage																									50.00%				150.00%
Share-based Compensation	17,037,000	24,089,000	18,437,000		14,517,000	20,620,000	13,148,000													1,400,000
Aggregate pre-tax intrinsic value of restricted stock units outstanding which includes performance based awards which are subject to milestone attainments	60,400,000
Common stock closing price per share	$ 9.90
Value of restricted stock issued during period	$ 22,400,000