State aggregate market value of voting and non-voting common equity held by non-affiliates computed by reference to price at which the common equity was last sold, or average bid and asked price of such common equity, as of the last business day of registrant's most recently completed second fiscal quarter. The public float should be reported on the cover page of the registrants form 10K.

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Goodwill and Other Intangible Assets (Details) (USD $)	3 Months Ended	12 Months Ended					9 Months Ended		12 Months Ended
Goodwill and Other Intangible Assets (Details) (USD $)	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Sep. 27, 2013	Dec. 31, 2012	Dec. 31, 2013 Peripherals	Dec. 31, 2012 Peripherals	Mar. 31, 2014 Peripherals	Mar. 31, 2013 Peripherals	Mar. 31, 2012 Peripherals	Mar. 31, 2014 Video conferencing	Mar. 31, 2013 Video conferencing	Mar. 31, 2012 Video conferencing	Mar. 31, 2014 Video conferencing Income approach analysis
Goodwill and Other Intangible Assets
Market capitalization	$ 2,200,000,000				$ 1,324,236,669	$ 1,200,000,000
Goodwill and Other Intangibles
Operating income		119,303,000	(203,268,000)	172,725,000			117,000,000	35,000,000	131,326,000	25,829,000	180,167,000	(12,023,000)	(229,097,000)	(7,442,000)
Percentage of carrying value by which the fair value of each reporting unit exceeded the carrying value												23.00%
CAGR assumption (as a percent)															7.00%
Growth rate in fiscal year 2021 (as a percent)															4.00%
Hypothetical decrease in CAGR rate (as a percent)															1.40%
Discount rate assumption (as a percent)															15.00%
Hypothetical increase in discount rate (as a percent)															18.90%
Terminal growth rate assumption (as a percent)															4.00%
Hypothetical decrease in terminal value (as a percent)															0.00%
Percentage of carrying value by which the fair value of each reporting unit exceeded the carrying value															30.00%
Goodwill
Balance at the beginning of the period		341,357,000	560,523,000				216,744,000	220,860,000	216,744,000	220,860,000		124,613,000	339,663,000
Additions		202,000							202,000
Foreign currency impact		982,000	(550,000)									982,000	(550,000)
Goodwill impairment	0		(214,500,000)										(214,500,000)
Reclassified from (to) assets held for sale		2,469,000	(4,116,000)						2,469,000	(4,116,000)
Balance at the end of the period		$ 345,010,000	$ 341,357,000	$ 560,523,000					$ 219,415,000	$ 216,744,000	$ 220,860,000	$ 125,595,000	$ 124,613,000	$ 339,663,000