Loss Per Share (Tables)

3 Months Ended

Sep. 30, 2013

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 loss per common share for the three months ended September 30, 2013 and 2012 is as follows:

		Three Months Ended
		September 30,
		2013	2012
Basic loss per share computation
Numerator:
Net loss attributable to Globe Specialty Metals, Inc.	$	(6,852)	(5,705)
Denominator:
Weighted average basic shares outstanding		75,310,143	75,050,560
Basic loss per common share	$	(0.09)	(0.08)
Diluted loss per share computation
Numerator:
Net loss attributable to Globe Specialty Metals, Inc.	$	(6,852)	(5,705)
Denominator:
Weighted average basic shares outstanding		75,310,143	75,050,560
Effect of dilutive securities		—	—
Weighted average diluted shares outstanding		75,310,143	75,050,560
Diluted loss per common share	$	(0.09)	(0.08)