Segment and Geographic Information (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2016 USD ($) manufacturing_site business_group	Jun. 30, 2015 USD ($)
Segment and geographic information
Number of business groups | business_group	2
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	$ 184,935	$ 187,590
Operating loss (loss)	8,898	1,243
Depreciation and amortization expense	9,436	9,917
Restructuring charges included in Operating income (loss)
Restructuring charges	688	1,824
North and South America (“Americas”)
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	55,101	56,034
Europe, Middle East, Africa (“EMEA”)
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	60,486	61,557
Asia and Pacific Rim (“APAC”)
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	69,348	69,999
Corporate, Non-Segment [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Operating loss (loss)	(24,714)	(29,502)
Depreciation and amortization expense	1,303	1,219
Restructuring charges included in Operating income (loss)
Restructuring charges	$ 3	306
Solid Capacitors [Member]
Segment and geographic information
Number of Manufacturing Sites | manufacturing_site	9
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	$ 141,944	139,677
Operating loss (loss)	35,079	30,033
Depreciation and amortization expense	5,418	5,756
Restructuring charges included in Operating income (loss)
Restructuring charges	$ 136	232
Film and Electrolytic [Member]
Segment and geographic information
Number of Manufacturing Sites | manufacturing_site	10
Segment Reporting Information, Profit (Loss) [Abstract]
Net sales	$ 42,991	47,913
Operating loss (loss)	(1,467)	712
Depreciation and amortization expense	2,715	2,942
Restructuring charges included in Operating income (loss)
Restructuring charges	$ 549	$ 1,286