Stock-Based Compensation - Stock-Based Compensation Expense (Detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 30, 2012	Jan. 01, 2012	Dec. 30, 2012	Jan. 01, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Stock-based compensation expense	$ 1,489,000	$ 1,333,000	$ 3,010,000	$ 3,394,000
Cost of sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Stock-based compensation expense	175,000	104,000	289,000	232,000
Research and development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Stock-based compensation expense	328,000	576,000	437,000	1,366,000
Selling, general and administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Stock-based compensation expense	$ 986,000	$ 653,000	$ 2,284,000	$ 1,796,000