Net Income Per Common Share (Details) - USD ($) shares in Thousands		3 Months Ended			6 Months Ended
		Sep. 30, 2017	Jul. 01, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016	Apr. 01, 2017
Schedule of Debt Instruments [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	[1]	0		9,587	2,986	8,736
Antidilutive shares excluded from computation of dilutive net income per common share		1,000			3,200
Two And Six Two Five Percent Senior Convertible Debentures [Member]
Schedule of Debt Instruments [Line Items]
Debt Instrument, Face Amount		$ 0	$ 0		$ 0		$ 457,918,000
Two And Six Two Five Percent Senior Convertible Debentures [Member]
Schedule of Debt Instruments [Line Items]
Debt Instrument, Face Amount			$ 600,000,000
Debt Instrument, Interest Rate, Stated Percentage			2.625%
Debt Instrument, Maturity Date			Jun. 15, 2017

[1] Three Months Ended Six Months Ended(In thousands, except per share amounts)September 30, 2017 October 1, 2016 September 30, 2017 October 1, 2016Net income available to common stockholders$167,532 $164,192 $334,777 $327,241Weighted average common shares outstanding-basic248,094 253,466 247,960 253,056Dilutive effect of employee equity incentive plans2,532 2,126 2,949 2,319Dilutive effect of 2017 Convertible Notes— 9,587 2,986 8,736Dilutive effect of warrants7,591 5,194 7,844 3,774Weighted average common shares outstanding-diluted258,217 270,373 261,739 267,885Basic earnings per common share$0.68 $0.65 $1.35 $1.29Diluted earnings per common share$0.65 $0.61 $1.28 $1.22