Restructuring (Details) (USD $)	12 Months Ended																		3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Termination Benefits	Mar. 31, 2013 Termination Benefits	Mar. 31, 2014 Lease Exit Costs	Mar. 31, 2013 Lease Exit Costs	Mar. 31, 2013 Other	Mar. 31, 2014 Video conferencing	Mar. 31, 2013 Video conferencing	Mar. 31, 2012 Video conferencing	Mar. 31, 2013 Q1'2013 Restructuring Cost of Goods Sold	Mar. 31, 2013 Q1'2013 Restructuring Swiss Plan	Mar. 31, 2013 Q1'2013 Restructuring Termination Benefits	Mar. 31, 2013 Q1'2013 Restructuring Lease Exit Costs	Mar. 31, 2013 Q4'2013 Restructuring Cost of Goods Sold	Mar. 31, 2013 Q4'2013 Restructuring Swiss and Taiwan Plans	Mar. 31, 2014 Q4'2013 Restructuring Termination Benefits	Mar. 31, 2013 Q4'2013 Restructuring Termination Benefits	Mar. 31, 2014 Q4'2013 Restructuring Lease Exit Costs item	Mar. 31, 2014 Q4'2013 Restructuring Lease Exit Costs	Mar. 31, 2014 Q2'2014 Restructuring Video conferencing Termination Benefits	Mar. 31, 2014 Q2'2014 Restructuring Video conferencing Lease Exit Costs
Restructuring reserve
Balance at the beginning of the period	$ 13,458,000		$ 13,383,000		$ 75,000
Charges	13,811,000	43,704,000	6,463,000	41,088,000	7,348,000	1,308,000	1,308,000	5,800,000	4,200,000	0		2,200,000	25,900,000	1,300,000			1,500,000	15,200,000	5,400,000	6,700,000	5,000,000	600,000
Adjustment for deferred rent	1,450,000				1,450,000
Cash payments	(20,988,000)	(30,323,000)	(19,534,000)	(27,768,000)	(1,454,000)	(1,233,000)	(1,322,000)
Foreign exchange impact	(170,000)	77,000	(170,000)	63,000			14,000
Balance at the end of the period	7,561,000	13,458,000	142,000	13,383,000	7,419,000	75,000
Legal, consulting and other costs													1,300,000			1,200,000
Number of buildings before restructuring of Silicon Valley campus																			2
Number of buildings after restructuring of Silicon Valley campus																			1
Charges related to discontinuance of certain product development											$ 3,000,000				$ 900,000