Segment Information (Details) (USD $)	3 Months Ended	12 Months Ended			9 Months Ended		12 Months Ended
	Dec. 31, 2013	Mar. 31, 2014 segment	Mar. 31, 2013	Mar. 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 Peripherals Other	Mar. 31, 2013 Peripherals Other	Mar. 31, 2012 Peripherals Other	Mar. 31, 2014 Peripherals OEM	Mar. 31, 2013 Peripherals OEM	Mar. 31, 2012 Peripherals OEM	Mar. 31, 2014 Peripherals Growth:	Mar. 31, 2013 Peripherals Growth:	Mar. 31, 2012 Peripherals Growth:	Mar. 31, 2014 Peripherals Growth: PC Gaming	Mar. 31, 2013 Peripherals Growth: PC Gaming	Mar. 31, 2012 Peripherals Growth: PC Gaming	Mar. 31, 2014 Peripherals Growth: Tablet & Other Accessories	Mar. 31, 2013 Peripherals Growth: Tablet & Other Accessories	Mar. 31, 2012 Peripherals Growth: Tablet & Other Accessories	Mar. 31, 2014 Peripherals Growth: Mobile Speakers	Mar. 31, 2013 Peripherals Growth: Mobile Speakers	Mar. 31, 2012 Peripherals Growth: Mobile Speakers	Mar. 31, 2014 Peripherals Profit Maximization:	Mar. 31, 2013 Peripherals Profit Maximization:	Mar. 31, 2012 Peripherals Profit Maximization:	Mar. 31, 2014 Peripherals Profit Maximization: Pointing Devices	Mar. 31, 2013 Peripherals Profit Maximization: Pointing Devices	Mar. 31, 2012 Peripherals Profit Maximization: Pointing Devices	Mar. 31, 2014 Peripherals Profit Maximization: PC Keyboards & Desktops	Mar. 31, 2013 Peripherals Profit Maximization: PC Keyboards & Desktops	Mar. 31, 2012 Peripherals Profit Maximization: PC Keyboards & Desktops	Mar. 31, 2014 Peripherals Profit Maximization: Audio-PC &Wearables	Mar. 31, 2013 Peripherals Profit Maximization: Audio-PC &Wearables	Mar. 31, 2012 Peripherals Profit Maximization: Audio-PC &Wearables	Mar. 31, 2014 Peripherals Profit Maximization: Video	Mar. 31, 2013 Peripherals Profit Maximization: Video	Mar. 31, 2012 Peripherals Profit Maximization: Video	Mar. 31, 2014 Peripherals Profit Maximization: Remotes	Mar. 31, 2013 Peripherals Profit Maximization: Remotes	Mar. 31, 2012 Peripherals Profit Maximization: Remotes	Mar. 31, 2014 Peripherals Non-Strategic:	Mar. 31, 2013 Peripherals Non-Strategic:	Mar. 31, 2012 Peripherals Non-Strategic:	Mar. 31, 2014 Video conferencing	Mar. 31, 2013 Video conferencing	Mar. 31, 2012 Video conferencing
Segment Information
Number of reporting segments		2
Net sales by product categories, excluding intercompany transactions
Total net sales		$ 2,128,713,000	$ 2,099,277,000	$ 2,316,203,000			$ 2,008,028,000	$ 1,962,237,000	$ 2,168,742,000	$ 37,000,000	$ 86,102,000	$ 160,179,000	$ 141,749,000	$ 141,186,000	$ 185,959,000	$ 446,824,000	$ 297,776,000	$ 252,485,000	$ 186,926,000	$ 144,512,000	$ 186,190,000	$ 172,484,000	$ 119,856,000	$ 44,326,000	$ 87,414,000	$ 33,408,000	$ 21,969,000	$ 1,382,455,000	$ 1,437,173,000	$ 1,570,119,000	$ 506,884,000	$ 521,083,000	$ 559,366,000	$ 415,512,000	$ 399,144,000	$ 383,697,000	$ 255,573,000	$ 292,245,000	$ 339,394,000	$ 137,115,000	$ 153,060,000	$ 196,662,000	$ 67,371,000	$ 71,641,000	$ 91,000,000	$ 37,000,000	$ 86,102,000	$ 160,179,000	$ 120,685,000	$ 137,040,000	$ 147,461,000
Segment operating income (loss) before other charges		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)
Other Income (Expense) [Abstract]
Share-based compensation		(25,546,000)	(25,198,000)	(31,529,000)
Amortization of intangibles		(17,771,000)	(23,571,000)	(27,198,000)
Interest income (expense), net		(397,000)	907,000	2,674,000
Other income (expense), net		1,993,000	(2,198,000)	7,655,000
Income (loss) before income taxes		77,582,000	(253,328,000)	124,327,000
Total operating Income (loss)		75,986,000	(252,037,000)	113,998,000
Restructuring charges		13,811,000	43,704,000				8,000,000	39,500,000	0																																								5,800,000	4,200,000	0
Impairment of other assets								2,200,000
Goodwill impairment charge	$ 0		$ 214,500,000																																															$ 214,500,000