Segment and Geographic Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) business_group manufacturing_site	Dec. 31, 2014 USD ($)	Mar. 31, 2015 USD ($)
Segment Reporting [Abstract]
Number of business groups | business_group			2
Segment and geographic information
Document Period End Date			Dec. 31, 2015
Net sales	$ 177,184	$ 201,310	$ 550,897	$ 629,484
Operating loss (loss)	8,493	9,302	23,723	21,466
Depreciation and amortization expense	9,674	9,720	28,856	30,694
Restructuring charges included in Operating income (loss)
Restructuring charges	1,714	6,063	3,561	9,580
Assets
Total assets	706,975		706,975		$ 752,792
North and South America (“Americas”)
Segment and geographic information
Net sales	56,411	63,703	170,525	201,852
Europe, Middle East, Africa (“EMEA”)
Segment and geographic information
Net sales	52,453	67,356	173,468	214,491
Asia and Pacific Rim (“APAC”)
Segment and geographic information
Net sales	68,320	70,251	206,904	213,141
Corporate, Non-Segment [Member]
Segment and geographic information
Operating loss (loss)	(21,096)	(23,664)	(72,807)	(72,627)
Depreciation and amortization expense	1,350	1,385	3,728	4,400
Restructuring charges included in Operating income (loss)
Restructuring charges	(27)	1,071	481	1,200
Assets
Total assets	55,338		55,338		64,111
Solid Capacitors [Member]
Segment and geographic information
Net sales	135,300	152,785	416,261	475,594
Operating loss (loss)	31,359	38,103	95,371	106,223
Depreciation and amortization expense	5,293	5,014	16,227	15,955
Restructuring charges included in Operating income (loss)
Restructuring charges	754	496	1,556	1,895
Assets
Total assets	425,031		$ 425,031		469,823
Number of Manufacturing Sites | manufacturing_site			9
Film and Electrolytic [Member]
Segment and geographic information
Net sales	41,884	48,525	$ 134,636	153,890
Operating loss (loss)	(1,770)	(5,137)	1,159	(12,130)
Depreciation and amortization expense	3,031	3,321	8,901	10,339
Restructuring charges included in Operating income (loss)
Restructuring charges	987	$ 4,496	1,524	$ 6,485
Assets
Total assets	$ 226,606		$ 226,606		$ 218,858
Number of Manufacturing Sites | manufacturing_site			10