Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Mar. 31, 2013
Carrying Value | Foreign Currency Forwards
Defined Benefit Plan Disclosure [Line Items]
Derivative Assets	$ 0	[1]	$ 25	[1]
Carrying Value | Commodity swaps
Defined Benefit Plan Disclosure [Line Items]
Derivative Assets	0	[1]	141	[1]
Carrying Value | Senior Secured Notes
Defined Benefit Plan Disclosure [Line Items]
Long-term Debt, Fair Value	(704,109)	[2]	(675,000)	[2]
Carrying Value | Convertible Senior Subordinated Notes
Defined Benefit Plan Disclosure [Line Items]
Long-term Debt, Fair Value	(51,900)	[2]	(55,750)	[2]
Estimated Fair Value | Foreign Currency Forwards
Defined Benefit Plan Disclosure [Line Items]
Derivative Assets	0	[1]	25	[1]
Estimated Fair Value | Commodity swaps
Defined Benefit Plan Disclosure [Line Items]
Derivative Assets	0	[1]	141	[1]
Estimated Fair Value | Senior Secured Notes
Defined Benefit Plan Disclosure [Line Items]
Long-term Debt, Fair Value	(502,558)	[2]	(580,500)	[2]
Estimated Fair Value | Convertible Senior Subordinated Notes
Defined Benefit Plan Disclosure [Line Items]
Long-term Debt, Fair Value	$ (11,548)	[2]	$ (52,864)	[2]

[1] These financial instruments were required to be measured at fair value, and were based on inputs as described in the three-tier hierarchy that prioritizes inputs used in measuring fair value as of the reported date:

[2] Classified as liabilities subject to compromise