Quarterly Information (Unaudited) (Details Textuals) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Mar. 31, 2014	Jun. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Quarterly Financial Data [Line Items]
Pre-tax charges (gains) pertaining to discontinued operations	$ 103,100		$ 22,200			$ 103,137	$ 22,190
Restructuring	$ 6,700					6,664	0	$ 0
Impairment of investments		$ 7,940	43,200	$ 7,940	$ 7,940	7,940	43,198	$ 0
Albemarle and Bond Holdings [Member]
Quarterly Financial Data [Line Items]
Impairment of equity method investments			$ 42,500			$ 7,900	$ 42,500