Income Taxes (Significant Components Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013	Mar. 31, 2012
Deferred tax assets:
Inventory valuation	$ 12,065	$ 3,240
Accrued expenses and allowances	5,077	3,656
Net operating loss carryforwards	28,162	105,220
Research and development tax credit carryforwards	37,054	36,032
State tax credit carryforwards	237	244
Capitalized research and development	6,601	9,779
Other	21,505	18,747
Total deferred tax assets	110,701	176,918
Valuation allowance for deferred tax assets	(23,232)	(29,075)
Net deferred tax assets	87,469	147,843
Deferred tax liabilities:
Depreciation and amortization	5,238	287
Acquisition intangibles	623	5,348
Total deferred tax liabilities	5,861	5,635
Total net deferred tax assets	$ 81,608	$ 142,208