Note 12 - Stock-based Compensation (Details) - Stock-based Compensation Expense Related to Stock Options and RSUs (USD $)	3 Months Ended		9 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based Compensation Expense	$ 4,222,000	$ 2,557,000	$ 10,949,000	$ 7,267,000
Cost of Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based Compensation Expense	496,000	165,000	983,000	519,000
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based Compensation Expense	442,000	566,000	2,124,000	1,395,000
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based Compensation Expense	$ 3,284,000	$ 1,826,000	$ 7,842,000	$ 5,353,000