Segment and Geographic Information (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2015 USD ($) manufacturing_site business_group	Jun. 30, 2014 USD ($)	Mar. 31, 2015 USD ($)
Segment Reporting [Abstract]
Number of business groups | business_group	2
Segment and geographic information
Document Period End Date	Jun. 30, 2015
Net sales	$ 187,590	$ 212,881
Operating loss (loss)	1,243	(606)
Depreciation and amortization expense	9,917	10,797
Restructuring charges included in Operating income (loss)
Restructuring charges	1,824	1,830
Assets
Total assets	749,795		$ 752,792
North and South America (“Americas”)
Segment and geographic information
Net sales	56,034	65,982
Europe, Middle East, Africa (“EMEA”)
Segment and geographic information
Net sales	61,557	77,205
Asia and Pacific Rim (“APAC”)
Segment and geographic information
Net sales	69,999	69,694
Corporate, Non-Segment [Member]
Segment and geographic information
Operating loss (loss)	(29,502)	(24,293)
Depreciation and amortization expense	1,219	1,502
Restructuring charges included in Operating income (loss)
Restructuring charges	306	111
Assets
Total assets	$ 58,787		64,111
Solid Capacitors
Segment and geographic information
Number of manufacturing sites | manufacturing_site	9
Net sales	$ 139,677	159,790
Operating loss (loss)	30,033	29,734
Depreciation and amortization expense	5,756	5,478
Restructuring charges included in Operating income (loss)
Restructuring charges	232	1,230
Assets
Total assets	$ 444,798		469,823
Film and Electrolytic [Member]
Segment and geographic information
Number of manufacturing sites | manufacturing_site	12
Net sales	$ 47,913	53,091
Operating loss (loss)	712	(6,047)
Depreciation and amortization expense	2,942	3,817
Restructuring charges included in Operating income (loss)
Restructuring charges	1,286	$ 489
Assets
Total assets	$ 246,210		$ 218,858