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Commitments and Contingencies (Details)
1 Months Ended 3 Months Ended
Dec. 15, 2017
Dec. 29, 2016
USD ($)
Sep. 30, 2015
USD ($)
Aug. 20, 2015
USD ($)
May 02, 2012
USD ($)
Aug. 31, 2017
USD ($)
Dec. 29, 2017
USD ($)
MW
Sep. 28, 2012
Loss Contingencies [Line Items]                
Litigation amount   $ 4,700,000            
Capacity of power plant unit | MW             360  
UGL Infrastructure Pty Limited                
Loss Contingencies [Line Items]                
Percentage of ownership interest in joint venture               50.00%
Nui Phao Mining Company                
Loss Contingencies [Line Items]                
Damages sought     $ 167,000,000          
Period on hearing on merits 21 days              
Judicial Council Of California - Unpaid Fees                
Loss Contingencies [Line Items]                
Litigation amount         $ 4,700,000      
Litigation contract amount       $ 4,700,000        
Judicial Council Of California, Disgorged Fees                
Loss Contingencies [Line Items]                
Litigation amount         $ 18,300,000      
Litigation contract amount       $ 18,300,000        
General Electric and GE Electrical International Inc | Pending Litigation | Minimum                
Loss Contingencies [Line Items]                
Damages sought           $ 665,500,000    
JKC Australia LNG Pty Limited | Pending Litigation                
Loss Contingencies [Line Items]                
Damages sought             $ 1,660,000,000