Debt (Details)	3 Months Ended						3 Months Ended				3 Months Ended		0 Months Ended		3 Months Ended	12 Months Ended	0 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Mar. 31, 2014 USD ($)	Aug. 28, 2012 USD ($)	Jun. 30, 2014 10.5% Senior Notes USD ($)	Mar. 31, 2014 10.5% Senior Notes USD ($)	Jun. 30, 2014 Advanced payment from OEM OEM USD ($)	Mar. 31, 2014 Advanced payment from OEM OEM USD ($)	Oct. 08, 2012 Advanced payment from OEM OEM USD ($)	Aug. 28, 2012 Advanced payment from OEM OEM USD ($)	Jun. 30, 2014 Advanced payment from OEM OEM Maximum USD ($)	Jun. 30, 2014 Advanced payment from OEM OEM Minimum USD ($)	Sep. 27, 2013 Revolving Line of Credit USD ($)	Sep. 24, 2013 Revolving Line of Credit USD ($)	Jun. 30, 2014 Revolving Line of Credit USD ($)	Mar. 31, 2014 Revolving Line of Credit USD ($)	Sep. 24, 2013 Revolving Line of Credit Base Rate	Sep. 27, 2013 Revolving Line of Credit LIBOR	Jun. 27, 2014 Letters of Credit One EUR (€)	Jun. 30, 2014 Letters of Credit One USD ($)	Mar. 31, 2014 Letters of Credit Two USD ($)	Mar. 31, 2014 Letters of Credit Two EUR (€)	Mar. 31, 2014 Letter of Credit Three [Member] USD ($)	Mar. 31, 2014 Letter of Credit Three [Member] EUR (€)	Jun. 30, 2014 Other USD ($)	Mar. 31, 2014 Other USD ($)
Debt
Total debt	$ 403,837,000		$ 398,589,000		$ 357,977,000	$ 358,144,000		$ 20,095,000								$ 18,449,000									$ 587,000	$ 1,901,000
Line of Credit Facility, Amount Outstanding															25,949,000
Repayments of Lines of Credit															2,600,000
Current maturities	(27,410,000)		(7,297,000)				(19,324,000)
Total long-term debt	376,427,000		391,292,000
Stated interest rate (as a percent)					10.50%	10.50%
Unamortized premium					3,144,000	2,977,000
Unamortized discount							323,000	203,000
Interest expense
Contractual interest expense	9,752,000	9,021,000
Amortization of debt issuance costs	425,000	425,000
Amortization of debt (premium) discount	(47,000)	62,000
Imputed interest on acquisition related obligations	287,000	526,000
Interest Expense, Lessee, Assets under Capital Lease	39,000
Interest expense	10,456,000	10,034,000
Maximum borrowing capacity															50,000,000
Amount borrowed													12,000,000	9,000,000					7,500,000
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											16,000,000	1,500,000	1,100,000	900,000	700,000
Number of Letters of Credit																2
Remaining borrowing capacity																				600,000
Amount agreed to be advanced				24,000,000						24,000,000
Amount outstanding					355,000,000	355,000,000	19,500,000	20,400,000
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