Segment Information (Details) (USD $)	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013 Segment	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Segment Information [Abstract]
Number of reportable segments									2
Selected income statement data [Abstract]
Net sales to external customers	$ 89,336,000	$ 116,275,000	$ 111,632,000	$ 89,023,000	$ 101,464,000	$ 84,097,000	$ 107,616,000	$ 70,510,000	$ 406,266,000	$ 363,687,000	$ 161,285,000
Intersegment revenue, net of cost										0
Gross profit (loss)	2,850,000	24,043,000	16,721,000	12,114,000	7,276,000	(1,581,000)	14,979,000	7,033,000	55,728,000	27,707,000	51,382,000
Operating loss	(94,333,000)	7,770,000	1,163,000	(3,425,000)	(6,112,000)	(16,589,000)	(237,000)	(4,549,000)	(88,825,000)	(27,487,000)	25,384,000
Net loss	(73,651,000)	935,000	(8,933,000)	(9,862,000)	(12,943,000)	(21,827,000)	(5,439,000)	(8,305,000)	(91,511,000)	(48,514,000)	12,220,000
Selected balance sheet data [Abstract]
Current assets	152,631,000				168,231,000				152,631,000	168,231,000
Non-current assets	214,443,000				333,667,000				214,443,000	333,667,000
TOTAL ASSETS	367,074,000				501,898,000				367,074,000	501,898,000
Current liabilities	219,773,000				170,419,000				219,773,000	170,419,000
Non-current liabilities	150,815,000				257,860,000				150,815,000	257,860,000
Total liabilities	370,588,000				428,279,000				370,588,000	428,279,000
Equity (deficit)	(3,514,000)				73,619,000				(3,514,000)	73,619,000	117,177,000	103,620,000
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	367,074,000				501,898,000				367,074,000	501,898,000
Selected Cash Flow Information [Abstract]
Net cash provided by (used in) operating activities									(31,061,000)	(38,488,000)	10,735,000
Net cash used in investing activities									(4,069,000)	(1,591,000)	(6,723,000)
Net cash provided by financing activities									21,902,000	70,182,000	(2,790,000)
Effect of exchange rate changes on cash									45,000	37,000	45,000
Cash - Beginning of year				32,617,000				2,477,000	32,617,000	2,477,000	1,210,000
Cash - End of year	19,434,000				32,617,000				19,434,000	32,617,000	2,477,000
Additional selected financial data [Abstract]
Depreciation and amortization									5,285,000	7,350,000	3,900,000
Capital expenditures									4,028,000	1,554,000	1,566,000
Rotating Electrical [Member]
Selected income statement data [Abstract]
Net sales to external customers									213,151,000	178,551,000	161,285,000
Intersegment revenue, net of cost										1,853,000
Gross profit (loss)									69,341,000	57,332,000	51,382,000
Operating loss									(47,481,000)	26,574,000	25,384,000
Net loss									(38,046,000)	14,300,000	12,220,000
Selected balance sheet data [Abstract]
Current assets	102,031,000				115,451,000				102,031,000	115,451,000
Non-current assets	175,055,000				179,167,000				175,055,000	179,167,000
TOTAL ASSETS	277,086,000				294,618,000				277,086,000	294,618,000
Current liabilities	68,716,000				72,987,000				68,716,000	72,987,000
Non-current liabilities	95,605,000				85,201,000				95,605,000	85,201,000
Total liabilities	164,321,000				158,188,000				164,321,000	158,188,000
Equity (deficit)	112,765,000				136,430,000				112,765,000	136,430,000
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	277,086,000				294,618,000				277,086,000	294,618,000
Selected Cash Flow Information [Abstract]
Net cash provided by (used in) operating activities									(4,969,000)	15,464,000	10,735,000
Net cash used in investing activities									(2,371,000)	(1,047,000)	(6,723,000)
Net cash provided by financing activities									21,639,000	61,060,000	(2,790,000)
Effect of exchange rate changes on cash									45,000	37,000	45,000
Cash - Beginning of year				32,379,000				2,477,000	32,379,000	2,477,000	1,210,000
Cash - End of year	19,346,000				32,379,000				19,346,000	32,379,000	2,477,000
Additional selected financial data [Abstract]
Depreciation and amortization									2,849,000	3,466,000	3,900,000
Capital expenditures									2,330,000	1,010,000	1,566,000
Undercar Product Line [Member]
Selected income statement data [Abstract]
Net sales to external customers									193,115,000	185,136,000	0
Intersegment revenue, net of cost										0
Gross profit (loss)									(13,613,000)	(29,625,000)	0
Operating loss									(123,139,000)	(54,061,000)	0
Net loss									(135,260,000)	(62,814,000)	0
Selected balance sheet data [Abstract]
Current assets	54,024,000				81,778,000				54,024,000	81,778,000
Non-current assets	44,334,000				186,896,000				44,334,000	186,896,000
TOTAL ASSETS	98,358,000				268,674,000				98,358,000	268,674,000
Current liabilities	183,645,000				126,430,000				183,645,000	126,430,000
Non-current liabilities	107,841,000				200,112,000				107,841,000	200,112,000
Total liabilities	291,486,000				326,542,000				291,486,000	326,542,000
Equity (deficit)	(193,128,000)				(57,868,000)				(193,128,000)	(57,868,000)
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	98,358,000				268,674,000				98,358,000	268,674,000
Selected Cash Flow Information [Abstract]
Net cash provided by (used in) operating activities									(26,092,000)	(53,952,000)	0
Net cash used in investing activities									(1,698,000)	(544,000)	0
Net cash provided by financing activities									263,000	9,122,000	0
Effect of exchange rate changes on cash									0	0	0
Cash - Beginning of year				238,000				0	238,000	0	0
Cash - End of year	88,000				238,000				88,000	238,000	0
Additional selected financial data [Abstract]
Depreciation and amortization									2,436,000	3,884,000	0
Capital expenditures									1,698,000	544,000	0
Eliminations [Member]
Selected income statement data [Abstract]
Net sales to external customers									0	0	0
Intersegment revenue, net of cost										(1,853,000)
Gross profit (loss)									0	0	0
Operating loss									81,795,000	0	0
Net loss									81,795,000	0	0
Selected balance sheet data [Abstract]
Current assets	(3,424,000)				(28,998,000)				(3,424,000)	(28,998,000)
Non-current assets	(4,946,000)				(32,396,000)				(4,946,000)	(32,396,000)
TOTAL ASSETS	(8,370,000)				(61,394,000)				(8,370,000)	(61,394,000)
Current liabilities	(32,588,000)				(28,998,000)				(32,588,000)	(28,998,000)
Non-current liabilities	(52,631,000)				(27,453,000)				(52,631,000)	(27,453,000)
Total liabilities	(85,219,000)				(56,451,000)				(85,219,000)	(56,451,000)
Equity (deficit)	76,849,000				(4,943,000)				76,849,000	(4,943,000)
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	(8,370,000)				(61,394,000)				(8,370,000)	(61,394,000)
Selected Cash Flow Information [Abstract]
Net cash provided by (used in) operating activities									0	0	0
Net cash used in investing activities									0	0	0
Net cash provided by financing activities										0	0
Effect of exchange rate changes on cash										0	0
Cash - Beginning of year				0				0	0	0	0
Cash - End of year	0				0				0	0	0
Additional selected financial data [Abstract]
Depreciation and amortization									0	0	0
Capital expenditures									$ 0	$ 0	$ 0