Restructuring Impairments and Other Costs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 29, 2015	Mar. 30, 2014	Dec. 27, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring, impairment and other costs, net of releases	$ 4.7	$ 6.1
Description of restructuring activity	We plan to eliminate our internal 5-inch and significantly reduce 6-inch wafer fabrication lines and rationalize our assembly and test capacity, resulting in the closure of our manufacturing and assembly facilities in West Jordan, Utah and Penang, Malaysia, as well as the remaining 5-inch wafer fabrication lines in Bucheon, South Korea
Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Expected additional restructuring costs			1.6
Accelerated depreciation costs			$ 10.0