Earnings (Loss) Per Share (Tables)

3 Months Ended

Sep. 30, 2012

Earnings (Loss) Per Share [Abstract]

Reconciliation of the amounts used to compute basic and diluted earnings per common share

The reconciliation of the amounts used to compute basic and diluted earnings (loss) per common share for the three months ended September 30, 2012 and 2011 is as follows:

		Three Months Ended
		September 30,
		2012	2011
Basic (loss) earnings per share computation
Numerator:
Net (loss) income attributable to Globe Specialty Metals, Inc.	$	(5,705)	20,693
Denominator:
Weighted average basic shares outstanding		75,050,560	75,019,481
Basic (loss) earnings per common share	$	(0.08)	0.28
Diluted (loss) earnings per share computation
Numerator:
Net (loss) income attributable to Globe Specialty Metals, Inc.	$	(5,705)	20,693
Denominator:
Weighted average basic shares outstanding		75,050,560	75,019,481
Effect of dilutive securities		—	1,769,502
Weighted average diluted shares outstanding		75,050,560	76,788,983
Diluted (loss) earnings per common share	$	(0.08)	0.27