Debt (Details)	3 Months Ended		9 Months Ended						9 Months Ended				9 Months Ended		0 Months Ended		9 Months Ended	0 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Mar. 31, 2013 USD ($)	Aug. 28, 2012 USD ($)	Dec. 31, 2013 10.5% Senior Notes USD ($)	Mar. 31, 2013 10.5% Senior Notes USD ($)	Dec. 31, 2013 Advanced payment from OEM OEM USD ($)	Mar. 31, 2013 Advanced payment from OEM OEM USD ($)	Oct. 08, 2012 Advanced payment from OEM OEM USD ($)	Aug. 28, 2012 Advanced payment from OEM OEM USD ($)	Dec. 31, 2013 Advanced payment from OEM OEM Maximum USD ($)	Dec. 31, 2013 Advanced payment from OEM OEM Minimum USD ($)	Sep. 27, 2013 Revolving Line of Credit USD ($)	Sep. 24, 2013 Revolving Line of Credit USD ($)	Dec. 31, 2013 Revolving Line of Credit USD ($) letters_of_credit	Sep. 24, 2013 Revolving Line of Credit Base Rate	Sep. 27, 2013 Revolving Line of Credit LIBOR	Dec. 31, 2013 Letters of Credit One USD ($)	Dec. 31, 2013 Letters of Credit One EUR (€)	Dec. 31, 2013 Letters of Credit Two USD ($)	Dec. 31, 2013 Letters of Credit Two EUR (€)	Dec. 31, 2013 Other USD ($)	Mar. 31, 2013 Other USD ($)
Debt
Total debt	$ 401,895,000		$ 401,895,000		$ 383,500,000		$ 358,304,000	$ 358,773,000	$ 20,690,000	$ 22,944,000							$ 21,000,000							$ 1,901,000	$ 1,783,000
Current maturities	(27,672,000)		(27,672,000)		(10,793,000)
Total long-term debt	374,223,000		374,223,000		372,707,000
Stated interest rate (as a percent)							10.50%	10.50%
Unamortized premium							3,304,000	3,773,000
Unamortized discount									469,000	1,056,000
Interest expense
Contractual interest expense	9,491,000	9,125,000	27,474,000	27,794,000
Amortization of debt issuance costs	426,000	426,000	1,278,000	1,278,000
Amortization of debt (premium) discount	14,000	48,000	118,000	(250,000)
Imputed interest on acquisition related obligations	418,000	648,000	1,421,000	2,018,000
Total interest expense	10,349,000	10,247,000	30,291,000	30,840,000
Maximum borrowing capacity																	50,000,000
Amount borrowed															12,000,000	9,000,000
Effective interest rate (as a percent)															4.00%	5.75%
Spread on variable rate basis (as a percent)																		2.50%	3.75%
Variable interest rate basis																			LIBOR
Term on borrowing															31 days
Amount of irrevocable standby letter of credit delivered											16,000,000									1,500,000	1,100,000	900,000	700,000
Number of letters of credit																	2
Number of letters of credit which reduced entity's availability under agreement																	3
Remaining borrowing capacity																	3,000,000
Amount agreed to be advanced						24,000,000						24,000,000
Amount outstanding							355,000,000	355,000,000	21,200,000	24,000,000
Monthly repayment of advanced amount, price ratio below threshold													1,000,000
Monthly repayment of advanced amount, price ratio above threshold													2,000,000
Threshold price ratio (as a percent)									110.00%
Cash balance to be maintained on last day of any fiscal quarter														60,000,000
Percentage of consolidated total assets accounted by subsidiary which applies for bankruptcy or other similar proceedings														20.00%
Period within which any proceeding filed against the entity is to be dismissed													60 days
Interest payable							$ 6,200,000	$ 15,500,000