Quarterly Results (Unaudited) (Schedule Of Unaudited Quarterly Statement Of Operations Data) (Details) (USD $)	3 Months Ended										12 Months Ended
	Mar. 31, 2012		Dec. 31, 2011	Sep. 24, 2011	Jun. 25, 2011	Mar. 26, 2011		Dec. 25, 2010	Sep. 25, 2010	Jun. 26, 2010	Mar. 31, 2012	Mar. 26, 2011	Mar. 27, 2010
Quarterly Results (Unaudited) [Abstract]
Net sales	$ 110,631,000	[1]	$ 122,368,000	$ 101,602,000	$ 92,242,000	$ 91,433,000	[2]	$ 95,625,000	$ 100,598,000	$ 81,915,000	$ 426,843,000	$ 369,571,000	$ 220,989,000
Gross margin	62,347,000	[1]	66,030,000	54,355,000	47,709,000	46,018,000	[2]	52,462,000	56,780,000	46,735,000	230,441,000	201,995,000	118,731,000
Net income	50,827,000	[1]	16,731,000	11,247,000	9,178,000	130,406,000	[2]	24,621,000	30,874,000	17,602,000	87,983,000	203,503,000	38,398,000
Basic income per share	$ 0.79	[1]	$ 0.26	$ 0.17	$ 0.14	$ 1.91	[2]	$ 0.36	$ 0.45	$ 0.26	$ 1.35	$ 3.00	$ 0.59
Diluted income per share	$ 0.75	[1]	$ 0.25	$ 0.17	$ 0.13	$ 1.80	[2]	$ 0.34	$ 0.42	$ 0.25	$ 1.29	$ 2.82	$ 0.59
Income tax benefit	(39,500,000)					(117,000,000)					(8,000,000)	(119,289,000)	(11,715,000)
Decrease in valuation allowance on deferred tax assets	37,300,000
Reduction in gross margins attributable to a production issue in March 2011						$ 4,200,000

[1] The $39.5 million tax benefit recorded in the fourth quarter of 2012 favorably impacted net income, as a result of a $37.3 million release in valuation allowance on deferred tax assets.

[2] Net income was favorably impacted by a $117.0 million benefit to tax expense to decrease the valuation allowance on our U.S. deferred tax assets, which was partially offset by reduced gross margins attributable to a charge of approximately $4.2 million due to a production issue with a new audio device that entered high volume production in March 2011.