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Description of Business (Sale of Photovoltaics and Digital Products Business) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2015
Apr. 17, 2015
Jan. 02, 2015
Dec. 10, 2014
Oct. 22, 2014
Sep. 17, 2014
Photovoltaics Business [Member] | Photovoltaics [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Asset purchase agreement, selling price       $ 150.0    
Discontinued Operations, Disposed of by Sale [Member] | Photovoltaics Business [Member] | Photovoltaics [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Asset purchase agreement, selling price           $ 150.0
Working capital adjustment $ 0.1          
Discontinued Operations, Disposed of by Sale [Member] | Digital Products Business [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Asset purchase agreement, selling price         $ 17.5  
Asset sale, promissory note, principal amount   $ 15.5 $ 1.5      
Accrued interest on note receivable   $ 0.2