Share Based Awards (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Sep. 30, 2013	Mar. 31, 2013
Summary of Stock Option Activity
Number of Shares Outstanding Beginning Balance	1,159,183
Weighted Average Exercise Price per Share Outstanding Beginning Balance	$ 30.54
Weighted Average Remaining Contractual Life Outstanding Beginning Balance (in years)	6 years 2 months 12 days	5 years 6 months
Number of Share Granted	469,000
Weighted Average Exercise Price per Share Granted	$ 18.76
Weighted Average Remaining Contractual Life Granted (in years)	7 years 8 months 12 days
Number of Shares Exercised	(79,214)
Weighted Average Exercise Price per Share Exercised	$ 19.38
Weighted Average Remaining Contractual Life Exercised (in years)	1 month 6 days
Aggregate Intrinsic Value, Exercised	$ 186
Number of Shares Forfeited/Canceled	(131,560)
Weighted Average Exercise Price per Share Forfeited/Canceled	$ 31.68
Weighted Average Remaining Contractual Life Forfeited/Canceled (in years)	5 years 4 months 24 days
Number of Shares Outstanding Ending Balance	1,417,409	1,159,183
Weighted Average Exercise Price per Share Outstanding Ending Balance	$ 27.59	$ 30.54
Weighted Average Remaining Contractual Life Outstanding Ending Balance (in years)	6 years 2 months 12 days	5 years 6 months
Aggregate Intrinsic Value Outstanding Ending Balance	1,562
Number of Shares Vested and expected to vest	1,329,729
Weighted Average Exercise Price per Share Vested and expected to vest	$ 27.68
Weighted Average Remaining Contractual Life Vested and expected to vest (in years)	6 years 2 months 12 days
Aggregate Intrinsic Value Vested and expected to vest	1,435
Number of Shares Exercisable	364,669
Weighted Average Exercise Price per Share Exercisable	$ 31.46
Weighted Average Remaining Contractual Life Exercisable (in years)	4 years 6 months
Aggregate Intrinsic Value Exercisable	$ 33