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Debt (Narrative) (Details) (USD $)
12 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended
Mar. 30, 2013
Mar. 30, 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. 02, 2010
3.25% Convertible Senior Unsecured Notes Due October 15, 2013 [Member]
Accounting Standards Update 2010-11 [Member]
Sep. 30, 2008
3.25% Convertible Senior Unsecured Notes Due October 15, 2013 [Member]
Common Class A [Member]
Mar. 30, 2013
3.25% Convertible Senior Unsecured Notes Due October 15, 2013 [Member]
Common Class A [Member]
Mar. 30, 2013
3.25% Convertible Senior Unsecured Notes Due October 15, 2013 [Member]
Common Class A [Member]
Sep. 27, 2008
2016 Notes [Member]
Jun. 30, 2012
2016 Notes [Member]
Prior To Credit Rating Adjustment [Member]
Jun. 30, 2012
2016 Notes [Member]
After Credit Rating Adjustment [Member]
Nov. 30, 2008
GO Zone Tax-Exempt Bonds Due October 2033 [Member]
Oct. 31, 2008
GO Zone Tax-Exempt Bonds Due October 2033 [Member]
Mar. 30, 2013
GO Zone Tax-Exempt Bonds Due October 2033 [Member]
Mar. 30, 2013
Standby Letters of Credit [Member]
Mar. 30, 2013
Bilateral Letters Of Credit [Member]
Debt Instrument [Line Items]                              
Amount available under credit facility $ 1,000,000,000                            
Amount available for borrowing under credit facility 958,000,000                            
Letters of credit issued amount                           42,000,000 150,000,000
Debt instrument, face amount     458,000,000                        
Interest rate   3.25% 3.25%         6.60%              
Conversion rate           59.5626                  
Principal amounts for conversion   1,000       1,000 1,000                
Conversion price, per share           $ 16.79 $ 16.79                
Initial Dividend Threshold         $ 0.04                    
Debt Instrument, Convertible, Subordinated Exchangeable Threshold Period, During Trading Period Evaluation             20 days                
Debt Instrument, Convertible, Subordinated Exchangeable Trading Period Evaluation in Preceding Quarter             30 days                
Minimum percentage of exchange price           130.00% 130.00%                
Minimum trade price             $ 21.83                
Debt Instrument, Convertible, Trading Period             5 days                
Debt Instrument, Convertible, Subordinated Exchangeable Measurement Period             10 days                
Percentage trading price per principal amount, upper limit             98.00%                
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       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         27,000,000                    
Option Indexed to Issuer's Equity, Strike Price             16.79                
Proceeds from sale of warrants         44,000,000                    
Shares able to be purchased through warrants         27,000,000                    
Exercise price of warrants, per share           22.17 22.17                
Maximum amount of shares that may be issued to satisfy conversion             35,900,000                
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             $ 22.17                
Additional stock issuance if increase in share price of ten percent             2,500,000                
Interest rate at period end                 6.85% 6.60%     0.15%    
Proceeds from the sale of Gulf Opportunity Zone tax-exempt bonds                       100,000,000      
Interest rate swap period in force                     5 years        
Syntroleum Corporation Responsibility of Guarantee                         50.00%    
Syntroleum Corporation Maximum Guarantee Responsibility                         $ 50,000,000