Debt (Details)	3 Months Ended		9 Months Ended			3 Months Ended								9 Months Ended	12 Months Ended			3 Months Ended						9 Months Ended						3 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2014 Minimum	Dec. 31, 2014 Maximum	Dec. 31, 2014 10.5% Senior Notes, net of premium of $2,634 and $3,144 as of December 31, 2014 and March 31, 2014, respectively USD ($)	Mar. 31, 2014 10.5% Senior Notes, net of premium of $2,634 and $3,144 as of December 31, 2014 and March 31, 2014, respectively USD ($)	Dec. 31, 2014 Advanced payment from OEM, net of discount of $323 as of March 31, 2014 USD ($)	Mar. 31, 2014 Advanced payment from OEM, net of discount of $323 as of March 31, 2014 USD ($)	Oct. 08, 2012 Advanced payment from OEM, net of discount of $323 as of March 31, 2014 USD ($)	Aug. 28, 2012 Advanced payment from OEM, net of discount of $323 as of March 31, 2014 USD ($)	Dec. 31, 2014 Advanced payment from OEM, net of discount of $323 as of March 31, 2014 Maximum USD ($)	Mar. 31, 2014 Revolving Line of Credit USD ($) letters_of_credit	Dec. 31, 2014 Revolving Line of Credit USD ($)	Sep. 30, 2014 Revolving Line of Credit USD ($)	Dec. 31, 2014 Domestic Line of Credit [Member]	Dec. 31, 2014 Domestic Line of Credit [Member] Minimum	Dec. 31, 2014 Domestic Line of Credit [Member] Minimum LIBOR	Dec. 31, 2014 Domestic Line of Credit [Member] Maximum	Dec. 31, 2014 Domestic Line of Credit [Member] Maximum LIBOR	Dec. 31, 2014 Letters of Credit One USD ($)	Dec. 31, 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 USD ($)	Mar. 31, 2014 Letter of Credit Three EUR (€)	Dec. 31, 2014 Foreign Line of Credit [Member] USD ($)	Dec. 31, 2014 Foreign Line of Credit [Member] LIBOR	Dec. 31, 2014 Foreign Line of Credit [Member] Minimum	Dec. 31, 2014 Foreign Line of Credit [Member] Minimum LIBOR	Dec. 31, 2014 Foreign Line of Credit [Member] Maximum	Dec. 31, 2014 Foreign Line of Credit [Member] Maximum LIBOR	Dec. 31, 2014 Other USD ($)	Mar. 31, 2014 Other USD ($)	Dec. 31, 2014 US Facility [Member] USD ($)	Dec. 31, 2014 Singapore Facility [Member] USD ($)
Debt
Document Period End Date			Dec. 31, 2014
Long-term debt outstanding								$ 355,000,000	$ 355,000,000
Revolving line of credit															18,449,000	46,448,000
Line of Credit Facility, Fair Value of Amount Outstanding																													17,000,000								29,400,000	12,000,000
Total debt	404,603,000		404,603,000		398,589,000			357,634,000	358,144,000	0	20,095,000																								521,000	1,901,000
Current maturities	(12,521,000)		(12,521,000)		(7,297,000)
Total long-term debt	392,082,000		392,082,000		391,292,000
Interest expense
Contractual interest expense	9,566,000	9,491,000	28,975,000	27,474,000
Amortization of debt issuance costs	267,000	426,000	1,132,000	1,278,000
Amortization of debt (premium) discount	(108,000)	14,000	(234,000)	118,000
Amortization of Acquisition Costs	163,000	418,000	672,000	1,421,000
Interest expense on capital lease	50,000	0	136,000	0
Total interest expense	9,938,000	10,349,000	30,681,000	30,291,000
Maximum borrowing capacity																75,000,000	50,000,000
Line of Credit Facility, Current Borrowing Capacity																60,000,000
Line of Credit Facility, Additional Borrowing Capacity																15,000,000
Line of Credit Facility, Interest Rate Description																			.01	.02	.015	.025									.0125	.0225	.0175	.0275
Line of Credit Facility, Covenant Terms						.125	7500000											3750000
Debt Instrument, Basis Spread on Variable Rate																		2.00%												3.00%
Stated interest rate (as a percent)								10.50%	10.50%									5.00%												3.00%
Amount borrowed																								42,300,000
Repayments of lines of credit			14,342,000	0																			7,500,000	14,300,000
Remaining borrowing capacity																							3,300,000	3,300,000
Amount of irrevocable standby letter of credit delivered												16,000,000											16,000,000	16,000,000	1,300,000	1,100,000	800,000	700,000
Number of letters of credit															2
Amount agreed to be advanced													24,000,000
Monthly repayment of advanced amount, price ratio below threshold														1,000,000.0
Interest payable								6,200,000	15,500,000
Debt instrument, unamortized premium								2,807,000	3,144,000
Debt instrument, unamortized discount										$ 111,000	$ 323,000