Equity Compensation (Summary Of Effect Of Stock-Based Compensation On Cost Of Goods Sold) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Mar. 31, 2012	Mar. 26, 2011	Mar. 27, 2010
Equity Compensation [Abstract]
Cost of sales	$ 398	$ 243	$ 212
Research and development	5,590	2,641	1,882
Sales, general and administrative	6,190	5,257	3,224
Effect on pre-tax income	12,178	8,141	5,318
Total share based compensation expense (net of taxes)	12,178	8,141	5,318
Share based compensation effects on basic earnings (loss) per share	$ 0.19	$ 0.12	$ 0.08
Share based compensation effects on diluted earnings (loss) per share	$ 0.18	$ 0.11	$ 0.08
Share based compensation effects on operating activities cash flow	12,178	8,141	5,318
Share based compensation effects on financing activities cash flow

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Allocated Share Based Compensation Expense Research And Development

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Allocated Share Based Compensation Expense Sales General And Administrative

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Share Based Compensation Effects On Basic Earnings (Loss) Per Share

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Share Based Compensation Effects On Diluted Earnings (Loss) Per Share

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Share Based Compensation Effects On Financing Activities Cash Flow

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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