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Accounting Policies - Dissolution of Global Alliance (Details)
Oct. 01, 2015
Sep. 30, 2015
Disposal Group, Disposed of by Sale, Not Discontinued Operations | GDTNA    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Noncontrolling interest, ownership percentage by parent 75.00%  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | DGT    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Equity method investment, ownership percentage 25.00%  
NGY    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Equity method investment, ownership percentage   25.00%
Equity method investment, ownership percentage by SRI   75.00%
Ownership interest acquired 75.00%  
GDTNA    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Noncontrolling interest, ownership percentage by SRI   25.00%
GDTNA | Disposal Group, Held-for-sale, Not Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Noncontrolling interest, ownership percentage by parent   75.00%
DGT | Disposal Group, Held-for-sale, Not Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Equity method investment, ownership percentage   25.00%
GDTE    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Noncontrolling interest, ownership percentage by parent   75.00%
Noncontrolling interest, ownership percentage by SRI   25.00%
Noncontrolling interest acquired 25.00%  
DGT    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Equity method investment, ownership percentage by SRI   75.00%