Restructuring (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Reconciliation of restructuring liability
Costs charged to expense	$ 14,122	$ 18,719	$ 14,254
Personnel reduction costs
Reconciliation of restructuring liability
Balance at the beginning of the period	13,509	11,474	1,827
Costs charged to expense	10,567	16,370	12,334
Costs paid or settled	(18,235)	(13,976)	(2,592)
Change in foreign exchange	376	(359)	(95)
Balance at the end of the period	6,217	13,509	11,474
Manufacturing and sales office relocation costs
Reconciliation of restructuring liability
Balance at the beginning of the period	567	0	0
Costs charged to expense	3,555	2,349	1,920
Costs paid or settled	(4,122)	(1,782)	(1,920)
Change in foreign exchange	0	0	0
Balance at the end of the period	$ 0	$ 567	$ 0