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Quarterly Information (Unaudited) (Details Textuals) (USD $)
3 Months Ended 12 Months Ended
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Quarterly Financial Data [Line Items]            
Pre-tax charges (gains) pertaining to discontinued operations $ 103,100,000   $ 22,200,000 $ 103,137,000 $ 22,190,000  
Restructuring 6,700,000     6,664,000 0 0
Impairment of investments   7,900,000 44,600,000 7,940,000 44,598,000 0
Impairment of available for sale securities     2,100,000   2,100,000  
Albemarle and Bond Holdings [Member]
           
Quarterly Financial Data [Line Items]            
Impairment of equity method investments     $ 42,500,000 $ 7,900,000 $ 42,500,000