Debt (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified			0 Months Ended			0 Months Ended	1 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended					1 Months Ended			1 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Oct. 15, 2013 3.25% Convertible Senior Unsecured Notes Due October 15, 2013 [Member]	Sep. 28, 2013 3.25% Convertible Senior Unsecured Notes Due October 15, 2013 [Member]	Sep. 30, 2008 3.25% Convertible Senior Unsecured Notes Due October 15, 2013 [Member]	Oct. 15, 2013 3.25% Convertible Senior Unsecured Notes Due October 15, 2013 [Member] Common Class A [Member]	Sep. 30, 2008 3.25% Convertible Senior Unsecured Notes Due October 15, 2013 [Member] Common Class A [Member]	Sep. 28, 2013 3.25% Convertible Senior Unsecured Notes Due October 15, 2013 [Member] Common Class A [Member]	Jan. 01, 2011 3.25% Convertible Senior Unsecured Notes Due October 15, 2013 [Member] Accounting Standards Update 2010-11 [Member]	Oct. 02, 2010 3.25% Convertible Senior Unsecured Notes Due October 15, 2013 [Member] Accounting Standards Update 2010-11 [Member]	Sep. 29, 2012 2016 Notes [Member] Prior To Credit Rating Adjustment [Member]	Apr. 02, 2011 2016 Notes [Member] Prior To Credit Rating Adjustment [Member]	Sep. 29, 2012 2016 Notes [Member] After Credit Rating Adjustment [Member]	Apr. 02, 2011 2016 Notes [Member] After Credit Rating Adjustment [Member]	Jun. 30, 2012 4.50% Senior Notes Due June 2022 (2022 Notes) [Member]	Sep. 28, 2013 4.50% Senior Notes Due June 2022 (2022 Notes) [Member]	Sep. 29, 2012 4.50% Senior Notes Due June 2022 (2022 Notes) [Member]	Oct. 31, 2008 GO Zone Tax-Exempt Bonds Due October 2033 [Member]	Sep. 28, 2013 GO Zone Tax-Exempt Bonds Due October 2033 [Member]	Sep. 28, 2013 Standby Letters of Credit [Member]	Sep. 28, 2013 Bilateral Letters Of Credit [Member]
Debt Instrument [Line Items]
Maturities of debt in 2014	$ 514,000,000
Maturities of debt in 2015	12,000,000
Maturities of debt in 2016	645,000,000
Maturities of debt in 2017	4,000,000
Maturities of debt in 2018	120,000,000
Amount available under credit facility	1,000,000,000
Amount available for borrowing under credit facility	958,000,000
Letters of credit issued amount																				42,000,000	146,000,000
Debt instrument, face amount					458,000,000												1,000,000,000
Interest rate				3.25%	3.25%											4.50%	4.50%
Debt instrument, interest rate, effective percentage										8.26%
Discount on note recognized from adoption of accounting standard										92,000,000
After tax amount recorded to capital in excess of par value										56,000,000
Discount Accretion Term (years)									5 years
Deferred tax assets							36,000,000
Call options purchased in private transactions - purchase price							94,000,000
Number of class A stock that can be acquired through call options							27
Option Indexed to Issuer's Equity, Strike Price							16.78
Proceeds from sale of warrants							44,000,000
Shares able to be purchased through warrants							27
Exercise price of warrants, per share							22.16
Sensitivity of increase in stock price that would result in the issuance of additional stock								10.00%
Conversion price factoring convertible note hedge and warrant transactions, per share								$ 22.16
Additional stock issuance if increase in share price of 10%								2.5
Share Price								$ 28.60
Additional Stock Issuance Required if Warrants are Exercised at Price Equal to Period End Closing Share Price								6.1
Repayments of Long-term Debt			458,000,000
Conversion of Convertible Securities, shares						11.7
Stock Redeemed or Called During Period, Shares						11.7
Interest rate at period end											6.85%	7.35%	6.60%	6.85%					0.07%
Debt Instrument, Unamortized Discount	6,000,000	28,000,000															5,000,000
Issue price percent of face value															99.458%
Proceeds from Issuance of Unsecured Debt															995,000,000
Payments of Debt Issuance Costs															9,000,000
Proceeds from the sale of Gulf Opportunity Zone tax-exempt bonds																		100,000,000
Syntroleum Corporation Responsibility of Guarantee																			50.00%
Syntroleum Corporation Maximum Guarantee Responsibility																			$ 50,000,000