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Stock-Based Employee Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 30, 2012	Jan. 01, 2012	Dec. 30, 2012	Jan. 01, 2012
Compensation Expense
Compensation Expense	$ 2,774	$ 4,425	$ 9,306	$ 12,574
Cost of revenue [Member]
Compensation Expense
Compensation Expense	295	535	850	1,415
Research and development [Member]
Compensation Expense
Compensation Expense	1,531	2,174	4,369	6,493
Selling, general and administrative [Member]
Compensation Expense
Compensation Expense	948	1,603	3,561	4,458
Discontinued operations [Member]
Compensation Expense
Compensation Expense	$ 0	$ 113	$ 526	$ 208

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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