Write Down of Long-Lived Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Solid Capacitors	Dec. 31, 2012 Solid Capacitors	Dec. 31, 2013 Solid Capacitors	Dec. 31, 2012 Solid Capacitors	Dec. 31, 2013 Film and Electrolytic	Sep. 30, 2012 Film and Electrolytic
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment charges	$ 3,358	$ 3,084	$ 3,358	$ 7,318	$ 2,800	$ 3,100	$ 2,800	$ 3,100	$ 600	$ 4,200