Segment and Geographic Information (Details) (USD $)	3 Months Ended
	Jun. 30, 2014 business_group	Jun. 30, 2013	Mar. 31, 2014
Segment Reporting [Abstract]
Number of business groups	2
Segment and geographic information
Net sales	$ 212,881,000	$ 202,057,000
Operating loss	(606,000)	(18,212,000)
Depreciation and amortization expenses	10,797,000	13,639,000
Restructuring charges included in Operating income (loss)
Restructuring charges	1,830,000	4,610,000
Assets
Total assets	838,643,000		843,667,000
North and South America ("Americas")
Segment and geographic information
Net sales	65,982,000	59,353,000
Europe, Middle East, Africa ("EMEA")
Segment and geographic information
Net sales	77,205,000	72,991,000
Asia and Pacific Rim ("APAC")
Segment and geographic information
Net sales	69,694,000	69,713,000
Unallocated/Corporate
Segment and geographic information
Operating loss	(24,293,000)	(24,702,000)
Depreciation and amortization expenses	1,502,000	1,914,000
Restructuring charges included in Operating income (loss)
Restructuring charges	111,000	155,000
Assets
Total assets	78,583,000		76,429,000
Solid Capacitors
Segment and geographic information
Number of manufacturing sites	9
Net sales	159,790,000	149,401,000
Operating loss	29,734,000	12,792,000
Depreciation and amortization expenses	5,478,000	7,310,000
Restructuring charges included in Operating income (loss)
Restructuring charges	1,230,000	3,045,000
Write down of long-lived assets	2,800,000	3,100,000
Net curtailment and settlement gain (loss) on benefit plans		(400,000)
Assets
Total assets	486,406,000		479,377,000
Film and Electrolytic
Segment and geographic information
Number of manufacturing sites	12
Net sales	53,091,000	52,656,000
Operating loss	(6,047,000)	(6,302,000)
Depreciation and amortization expenses	3,817,000	4,415,000
Restructuring charges included in Operating income (loss)
Restructuring charges	489,000	1,410,000
Write down of long-lived assets	600,000
Assets
Total assets	$ 273,654,000		$ 287,861,000