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Organization and Business Operations	3 Months Ended
Organization and Business Operations	Sep. 30, 2012
Organization and Business Operations [Abstract]
Organization and Business Operations	(1) Organization and Business Operations Globe Specialty Metals, Inc. and subsidiary companies (the Company, we, or our) is among the world's largest producers of silicon metal and silicon-based alloys, important ingredients in a variety of industrial and consumer products. The Company's customers include major silicone chemical, aluminum and steel manufacturers, auto companies and their suppliers, ductile iron foundries, manufacturers of photovoltaic solar cells and computer chips, and concrete producers.