Note 14 - Stock-based Compensation (Details) - Stock-based Compensation Expense Related to Stock Options and RSUs (USD $)	12 Months Ended
	Mar. 29, 2015	Mar. 30, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based Compensation Expense	$ 13,614,000	$ 8,852,000	$ 4,788,000
Cost of Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based Compensation Expense	1,105,000	714,000	469,000
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based Compensation Expense	2,661,000	1,974,000	789,000
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based Compensation Expense	$ 9,848,000	$ 6,164,000	$ 3,530,000