Restructuring Impairments and Other Costs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013	Dec. 30, 2015 Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges, net of releases	$ 31.7	$ 3.5	$ 42.5	$ 8.1
Description of restructuring activity			The company will eliminate its internal five-inch and significantly reduce six-inch wafer fabrication lines and rationalize it's assembly and test capacity, resulting in the closure of its manufacturing and assembly facilities in West Jordan, Utah and Penang, Malaysia, as well as the remaining five-inch wafer fabrication lines in Bucheon, South Korea.
Expected additional restructuring costs					1.8
Accelerated depreciation costs					$ 17.0