Condensed Quarterly Results (Unaudited) - Quarterly Financial Information (Parenthetical) (Detail) (USD $)	1 Months Ended	3 Months Ended				12 Months Ended
	Mar. 30, 2014	Mar. 29, 2015	Dec. 28, 2014	Mar. 30, 2014	Jun. 30, 2013	Mar. 29, 2015	Mar. 30, 2014
Schedule Of Quarterly Financial Information [Line Items]
Special charges		$ 5,600,000		$ 56,500,000	$ 12,000,000	$ 10,520,000	$ 74,853,000
Exit costs		3,500,000		10,600,000	9,600,000	6,946,000	26,491,000
Asset impairment charges		2,100,000		4,900,000	2,400,000	3,074,000	7,322,000
Retroactive reinstatement of the federal research tax credit			3,700,000
Patent license agreement, prior periods	41,000,000			41,000,000			41,040,000
Valuation Allowance, State Tax Credits and Net Operating Loss Carryforwards [Member]
Schedule Of Quarterly Financial Information [Line Items]
Incremental tax charges				$ 14,700,000