Debt (Details) (USD $)	0 Months Ended
	Apr. 03, 2012	Mar. 27, 2012	May 05, 2010	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Debt Instrument [Line Items]
Total debt				$ 391,371,000	$ 398,589,000
Current maturities, net of discount of $278 as of March 31, 2014				(962,000)	(7,297,000)
Total long-term debt				390,409,000	391,292,000
Unamortized discount, current maturities				0	278,000
10.5% Senior Notes
Debt Instrument [Line Items]
Total debt				357,461,000	358,144,000
Proceeds from Issuance of Debt	15,000,000	110,000,000	230,000,000
Stated interest rate (as a percent)			10.50%	10.50%	10.50%
Unamortized premium		6,100,000		2,461,000	3,144,000
Advanced payment from OEM
Debt Instrument [Line Items]
Total debt				0	20,095,000
Unamortized discount				0	45,000	323,000
Revolving Line of Credit
Debt Instrument [Line Items]
Total debt					18,449,000
Other Debt Obligations [Member]
Debt Instrument [Line Items]
Total debt				$ 462,000	$ 1,901,000