Restructuring - Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Reconciliation of restructuring liability
Costs charged to expense	$ 4,178	$ 13,017	$ 14,122
Personnel reduction costs
Reconciliation of restructuring liability
Balance at the beginning of the period	7,239	6,217	13,509
Costs charged to expense	1,803	10,345	10,567
Costs paid or settled	(8,273)	(7,995)	(18,235)
Change in foreign exchange	207	(1,328)	376
Balance at the end of the period	976	7,239	6,217
Manufacturing and sales office relocation costs
Reconciliation of restructuring liability
Balance at the beginning of the period	0	0	567
Costs charged to expense	2,375	2,672	3,555
Costs paid or settled	(2,375)	(2,672)	(4,122)
Change in foreign exchange	0	0	0
Balance at the end of the period	0	0	0
Film and Electrolytic
Reconciliation of restructuring liability
Costs charged to expense	$ 1,714	8,221	$ 5,657
Mexico and Macedonia [Member] | Film and Electrolytic | Manufacturing and sales office relocation costs
Reconciliation of restructuring liability
Costs charged to expense		$ 300