Note 8. Restructuring Charges and Exit Costs (Detail) (USD $)	1 Months Ended	3 Months Ended								12 Months Ended
	Jun. 30, 2011	Mar. 31, 2013	Dec. 30, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012	Jul. 03, 2011	Dec. 26, 2010	Jun. 27, 2010	Mar. 31, 2013	Apr. 01, 2012	Apr. 01, 2012	Mar. 27, 2011
Restructuring Charges		$ 300,000	$ 600,000	$ 300,000	$ 900,000	$ 13,900,000	$ 300,000			$ 1,600,000	$ 14,200,000	$ 14,200,000	$ 3,600,000
Restructuring and Related Cost, Number of Positions Eliminated						173
Severance Costs							100,000					4,200,000
Payments of Severance Charges												1,400,000
Business Exit Costs													11,100,000
Other Intangible Assets, Net													200,000
Proceeds from Sale of Other Assets	200,000
Restructuring Reserve, Period Increase (Decrease)								134,000	234,000
Restructuring Reserve		3,286,000				8,041,000				3,286,000	8,041,000	8,041,000	288,000
Impairment of Intangible Assets [Member] | Write Off Of Abandoned IPR&D [Member]
Business Exit Costs													800,000
Impairment of Intangible Assets [Member] | Write Down Of Carrying Value Of Intangible Assets [Member]
Business Exit Costs													6,700,000
Impairment of Intangible Assets [Member]
Business Exit Costs													7,500,000
Industrial Research Assistance Program [Member]
Restructuring Charges		500,000
Cost of Sales [Member]
Restructuring Charges										301,000		1,312,000	2,212,000
Operating Expense [Member]
Restructuring Charges										1,253,000		12,913,000	1,375,000
Belgium [Member]
Restructuring Reserve													81,000
Termination Of OTN And De-Duplication Products [Member] | Accelerated Amortization And Depreciation Charges [Member]
Other Restructuring Costs												1,700,000
Property And Equipment [Member] | Accelerated Amortization And Depreciation Charges [Member]
Other Restructuring Costs												200,000
Lease Contract Termination Costs [Member]
Restructuring Charges							100,000
Restructuring and Related Cost, Incurred Cost												7,000,000
Restructuring Reserve		2,860,000				5,235,000				2,860,000	5,235,000	5,235,000
Lease Abandonment Charges [Member]
Other Restructuring Costs												800,000
Restructuring Reserve						5,235,000					5,235,000	5,235,000	288,000
Accelerated Amortization And Depreciation Charges [Member]
Other Restructuring Costs												1,900,000
Termination Of Certain Electronic Design Automated License Agreements [Member]
Restructuring and Related Cost, Incurred Cost												3,900,000
Write Off Of Prepaid Training, Maintenance And License Fees [Member]
Restructuring and Related Cost, Incurred Cost												2,600,000
Costs Associated With The Industrial Research Assistance Program [Member]
Restructuring and Related Cost, Incurred Cost												500,000
Inventory Write Off Costs [Member]
Restructuring Charges							100,000
Business Exit Costs													2,100,000
Employee Severance [Member]
Business Exit Costs													1,200,000
Restructuring Reserve		$ 426,000				$ 2,806,000				$ 426,000	$ 2,806,000	$ 2,806,000