Globe Specialty Metals 10-Q 12 May 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Mar. 31, 2014	7-May-14
Document and Entity Information [Abstract]	'	'
Entity Registrant Name	'GLOBE SPECIALTY METALS INC	'
Entity Central Index Key	'0001383571	'
Current Fiscal Year End Date	'--06-30	'
Entity Well-known Seasoned Issuer	'Yes	'
Entity Voluntary Filers	'No	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	73,811,178
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Mar-14	'

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Mar. 31, 2014	Jun. 30, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$112,922	$169,676
Marketable securities	5,475	148
Accounts receivable, net of allowance for doubtful accounts of $819 and $793 at March 31, 2014 and June 30, 2013, respectively	95,330	83,816
Inventories	77,167	101,197
Deferred tax assets	4,173	11,504
Prepaid expenses and other current assets	22,094	26,190
Total current assets	317,161	392,531
Property, plant, and equipment, net of accumulated depreciation, depletion and amortization	458,144	422,447
Deferred tax assets	125	125
Goodwill	43,343	43,177
Other intangible assets	477	477
Investments in unconsolidated affiliates	5,973	5,973
Other assets	3,375	6,893
Total assets	828,598	871,623
Current liabilities:	'	'
Accounts payable	43,759	41,039
Short-term debt	15	284
Revolving credit agreements	0	9,000
Stock compensation accrual	12,214	17,530
Accrued expenses and other current liabilities	44,786	31,356
Total current liabilities	100,774	99,209
Long-term liabilities:	'	'
Revolving credit agreements	125,000	130,250
Deferred tax liabilities	44,980	37,375
Other long-term liabilities	48,568	58,709
Total liabilities	319,322	325,543
Commitments and contingencies (note 11)	'	'
Stockholders' equity:	'	'
Common stock, $0.0001 par value. Authorized, 150,000,000 shares; issued, 75,623,454 and 75,588,986 shares at March 31, 2014 and June 30, 2013, respectively	8	8
Additional paid-in capital	398,139	399,234
Retained earnings	62,895	70,628
Accumulated other comprehensive loss	-8,917	-4,918
Treasury stock at cost 1,748,351 and 282,437 shares at March 31, 2014 and June 30, 2013, respectively	-26,618	-4
Total Globe Specialty Metals, Inc. stockholders' equity	425,507	464,948
Noncontrolling interest	83,769	81,132
Total stockholders' equity	509,276	546,080
Total liabilities and stockholders' equity	$828,598	$871,623

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2014	Jun. 30, 2013
In Thousands, except Share data, unless otherwise specified
ASSETS	'	'
Allowance for doubtful accounts	$819	$793
Stockholders' equity:	'	'
Common stock, par value (in dollars per share)	$0.00	$0.00
Common stock, authorized (in shares)	150,000,000	150,000,000
Common stock, issued (in shares)	75,623,454	75,588,986
Treasury stock at cost (in shares)	1,748,351	282,437

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Condensed Consolidated Statements of Operations (Unaudited) [Abstract]	'	'	'	'
Net sales	$196,057	$195,845	$547,457	$576,493
Cost of goods sold	164,926	181,238	467,919	498,209
Selling, general, and administrative expenses	23,392	13,330	75,029	60,103
Contract acquisition cost	0	0	14,400	0
Curtailment gain	0	0	-5,831	0
Business interruption insurance recovery	0	-4,594	0	-4,594
Goodwill impairment	0	13,130	0	13,130
Impairment of long-lived assets	0	35,387	0	35,387
Gain on sale of business	0	0	0	0
Operating income (loss)	7,739	-42,646	-4,060	-25,742
Other income (expense):	'	'	'	'
Gain on remeasurement of equity investment	0	170	0	1,877
Bargain purchase gain	0	0	22,243	0
Interest income	1	211	33	599
Interest expense, net of capitalized interest	-1,012	-1,806	-6,940	-5,148
Foreign exchange loss	-1,999	-1,686	-3,008	-2,773
Other income (expense)	5	-179	23	-77
Income (loss) before provision for (benefit from) income taxes	4,734	-45,936	8,291	-31,264
Provision for (benefit from) income taxes	2,717	-5,941	-3,199	-1,837
Net income (loss)	2,017	-39,995	11,490	-29,427
Income attributable to noncontrolling interest, net of tax	-456	-140	-3,308	-1,345
Net income (loss) attributable to Globe Specialty Metals, Inc.	$1,561	($40,135)	$8,182	($30,772)
Weighted average shares outstanding:	'	'	'	'
Basic (in shares)	74,291,202	75,301,549	74,963,601	75,174,392
Diluted (in shares)	74,434,780	75,301,549	75,070,154	75,174,392
(Loss) earnings per common share:	'	'	'	'
Basic (in dollars per share)	$0.02	($0.53)	$0.11	($0.41)
Diluted (in dollars per share)	$0.02	($0.53)	$0.11	($0.41)
Cash dividends declared per common share (in dollars per share)	$0.08	$0.06	$0.21	$0.31

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) [Abstract]	'	'	'	'
Net income (loss)	$2,017	($39,995)	$11,490	($29,427)
Other comprehensive (loss) income	'	'	'	'
Foreign currency translation adjustment	-3,251	-1,684	-4,705	-119
Pension liability adjustment, net of tax expense of $18	-33	0	35	0
Unrealized loss on available for sale securities, net of tax	0	0	0	-1
Total other comprehensive loss	-3,284	-1,684	-4,670	-120
Comprehensive (loss) income	-1,267	-41,679	6,820	-29,547
Comprehensive (loss) income attributable to noncontrolling interest	-102	-154	2,637	1,567
Comprehensive (loss) income attributable to Globe Specialty Metals, Inc.	($1,165)	($41,525)	$4,183	($31,114)

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) (Parenthetical) (USD $)	3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2014
Other comprehensive (loss) income	'	'
Pension liability adjustment, tax expense	$18	$18

Condensed_Consolidated_Stateme3

Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (USD $)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock at Cost [Member]	Noncontrolling Interest [Member]	Total
In Thousands, except Share data
Balance at Jun. 30, 2012	$8	$405,675	$119,863	($6,840)	($4)	$85,097	$603,799
Balance (in shares) at Jun. 30, 2012	75,332,000	'	'	'	'	'	'
Share-based compensation	0	-7,712	0	0	0	0	-7,712
Share-based compensation (in shares)	2,000	'	'	'	'	'	'
Stock option exercises	0	1,000	0	0	0	0	1,000
Stock option exercises (in shares)	250,000	'	'	'	'	'	'
Yonvey shares purchased	0	-1,939	0	0	0	-1,510	-3,449
Quebec Silicon purchase price allocation adjustments	0	0	0	0	0	1,895	1,895
Cash dividend	0	0	-23,500	0	0	0	-23,500
Comprehensive (loss) income	0	0	-30,772	-342	0	1,567	-29,547
Balance at Mar. 31, 2013	8	397,024	65,591	-7,182	-4	87,049	542,486
Balance (in shares) at Mar. 31, 2013	75,584,000	'	'	'	'	'	'
Balance at Jun. 30, 2013	8	399,234	70,628	-4,918	-4	81,132	546,080
Balance (in shares) at Jun. 30, 2013	75,589,000	'	'	'	'	'	'
Share-based compensation	0	-1,275	0	0	0	0	-1,275
Share-based compensation (in shares)	4,000	'	'	'	'	'	'
Stock option exercises	0	180	0	0	0	0	180
Stock option exercises (in shares)	30,000	'	'	'	'	'	33,334
Share repurchase	0	0	0	0	-26,614	0	-26,614
Share repurchase (in shares)	0	'	'	'	'	'	'
Cash dividend	0	0	-15,915	0	0	0	-15,915
Comprehensive (loss) income	0	0	8,182	-3,999	0	2,637	6,820
Balance at Mar. 31, 2014	$8	$398,139	$62,895	($8,917)	($26,618)	$83,769	$509,276
Balance (in shares) at Mar. 31, 2014	75,623,000	'	'	'	'	'	'

Condensed_Consolidated_Stateme4

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:	'	'
Net income (loss)	$11,490	($29,427)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'
Depreciation and amortization	32,983	33,587
Depletion	948	1,134
Share-based compensation	-1,275	-7,712
Curtailment gain	-5,831	0
Bargain purchase gain	-22,243	0
Gain on remeasurement of equity investment	0	-1,877
Goodwill impairment	0	13,130
Impairment of long-lived assets	0	35,387
Unrealized foreign exchange loss	473	913
Amortization of deferred financing fees	3,621	600
Deferred taxes	3,345	-9,992
Amortization of customer contract liabilities	-5,293	-4,804
Accretion	192	190
Changes in operating assets and liabilities:	'	'
Accounts receivable, net	-11,706	-2,097
Inventories	25,227	67
Prepaid expenses and other current assets	3,926	-5,568
Accounts payable	3,974	-1,009
Accrued expenses and other current liabilities	-45	15,442
Other	1,430	1,793
Net cash provided by operating activities	41,216	39,757
Cash flows from investing activities:	'	'
Capital expenditures	-28,018	-36,305
Purchase of marketable securities	-5,841	0
Acquisition of businesses, net of cash acquired of $200 and $3,656, respectively	-3,800	-4,520
Net cash used in investing activities	-37,659	-40,825
Cash flows from financing activities:	'	'
Payments of short-term debt	-269	-28
Borrowings under revolving credit agreements	156,400	20,391
Payments under revolving credit agreements	-170,650	-10,375
Dividend payment	-15,915	-23,500
Debt issuance costs	-1,080	'
Proceeds from stock option exercises	180	1,000
Purchase of treasury shares	-26,614	'
Other financing activities	-1,917	-1,907
Net cash used in by financing activities	-59,865	-14,419
Effect of exchange rate changes on cash and cash equivalents	-446	-1,522
Net decrease in cash and cash equivalents	-56,754	-17,009
Cash and cash equivalents at beginning of period	169,676	178,010
Cash and cash equivalents at end of period	112,922	161,001
Supplemental disclosures of cash flow information:	'	'
Cash paid for interest, net of capitalized interest	2,783	4,396
Cash paid for income taxes, net of refunds totaling $7,698 and $87, respectively	($5,982)	$13,419

Condensed_Consolidated_Stateme5

Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Supplemental disclosures of cash flow information:	'	'
Net cash acquired for acquisition of a business	$200	$3,656
Refunds for income taxes	$7,698	$87

Organization_and_Business_Oper

Organization and Business Operations	9 Months Ended
	Mar. 31, 2014
Organization and Business Operations [Abstract]	'
Organization and Business Operations	'
	(1)           Organization and Business Operations
	Globe Specialty Metals, Inc. and subsidiaries (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.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	9 Months Ended
	Mar. 31, 2014
Summary of Significant Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	(2)           Summary of Significant Accounting Policies
	a. Basis of Presentation
	In the opinion of the Company’s management, the accompanying condensed consolidated financial statements include all adjustments necessary for a fair presentation in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) of the results for the interim periods presented and such adjustments are of a normal, recurring nature. The accompanying condensed consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2013. There have been no material changes to the Company’s significant accounting policies during the nine months ended March 31, 2014.
	b. Use of Estimates
	The Company prepares its condensed consolidated financial statements in accordance with U.S. GAAP. The preparation of these financial statements requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, as well as the disclosure of contingent assets and liabilities. The Company based its estimates and judgments on historical experience, known or expected trends and other factors that are believed to be reasonable under the circumstances. Actual results may differ from these estimates.
	c. Revenue Recognition
	Revenue is recognized when title, ownership, and risk of loss pass to the customer, all of which occurs when products are delivered to the Company’s customers or when products are picked up by a customer or a customer’s carrier. Written sales terms, including the selling price, are determined at the time of shipment or delivery. We have not experienced credit issues with our customers.
	d. Exploration Costs
	Costs incurred to maintain current production capacity at a mine and exploration expenditures are charged to operating costs as incurred, including costs related to drilling and study costs incurred.
	e. Recent Accounting Pronouncements
	In June 2011, the Financial Accounting Standards Board (FASB) amended its accounting guidance on the presentation of comprehensive income in financial statements to improve the comparability, consistency and transparency of financial reporting and to increase the prominence of items that are recorded in other comprehensive income. The new accounting guidance requires entities to report components of comprehensive income in either (1) a continuous statement of comprehensive income or (2) two separate but consecutive statements. The provisions of the guidance were effective as of the beginning of our 2013 fiscal year. Accordingly, we have presented the components of net income (loss) and other comprehensive (loss) income for the three and nine months ended March 31, 2014 and March 31, 2013 as two separate but consecutive statements. In February 2013, the FASB issued guidance that would require an entity to provide enhanced footnote disclosures to explain the effect of reclassification adjustments on other comprehensive income by component and provide tabular disclosure in the footnotes showing the effect of items reclassified from accumulated other comprehensive income on the line items of net income. The provisions of the guidance were effective as of the beginning of our 2014 fiscal year. We have adopted this standard during the current fiscal year. The adoption of this standard did not have any material effect on our consolidated financial condition or results of operations during the current periods.

Business_Combinations

Business Combinations	9 Months Ended
	Mar. 31, 2014
Business Combinations [Abstract]	'
Business Combinations	'
	(3)             Business Combinations
	Siltech:
	On November 21, 2013, the Company purchased 100% of the outstanding shares of Silicon Technology (Pty) Ltd. (Siltech) for $4,000. The Company paid for the acquisition from available cash. Siltech is a silicon-based alloy producer in South Africa with an annual production capacity of approximately 45,000 metric tons. The acquisition was made to increase the Company’s current silicon-based alloy capacity by approximately 30% and its strategic location will enable the Company to supplement its existing facility to service the large and improving European, Asian and Middle Eastern markets. The Siltech facility was in an idled status when purchased. The Company intends to restart operations at the facility in the second half of calendar year 2014, and the capital expenditures necessary to restart operations are estimated to be $5,000.
	The Siltech acquisition was recorded as a business combination under Accounting Standards Codification 805 (“ASC 805”), Business Combinations, with identifiable assets acquired and liabilities assumed provisionally recorded at their estimated fair values on the acquisition date while costs associated with the acquisition are expensed as incurred. The Company utilized the services of third-party valuation consultants, along with estimates and assumptions provided by the Company, to estimate the initial fair value of the net assets acquired. The third-party valuation consultants utilized several appraisal methodologies including income, market and cost approaches to estimate the fair value of the identifiable net assets acquired.
	Based on the preliminary purchase price allocation, the following table summarizes the estimated preliminary fair value amounts of the assets acquired and liabilities assumed at the date of acquisition:
	Net assets acquired:
			Amount
	Current assets	$	2,298
	Property, plant and equipment		46,500
	Accounts payable		(317)
	Accrued expenses		(10,478)
	Deferred tax liabilities		(11,760)
	Gain on bargain purchase		(22,243)
	Cash consideration paid	$	4,000
	The preliminary fair value of the identifiable net assets acquired of approximately $26,243 exceeded the purchase price of $4,000, resulting in a gain on bargain purchase of $22,243, which was recorded in the condensed consolidated income statement for the nine months ended March 31, 2014. ASC 805 requires that when the fair value of the net assets acquired exceeds the purchase price, resulting in a bargain purchase of a business, the acquirer must reassess the reasonableness of the values assigned to all of the net assets acquired, liabilities assumed and consideration transferred. The Company performed such reassessment and initially concluded that the preliminary values assigned for the Siltech acquisition are reasonable.
	The gain on bargain purchase was primarily attributable to the fact that Siltech was considered an ancillary business to the seller (Siltech being the seller’s only silicon-based alloys operation), coupled with the previous weaker silicon-based alloys pricing in the marketplace driven by end-user demand (which resulted in the idling of the facility by the seller in 2013).
	The initial accounting for the business combination is not complete because the evaluation necessary to assess the fair values of the net assets acquired is still in process. The primary areas that are not yet finalized relate to completion of the third-party appraisal of the property, plant and equipment acquired and the liabilities assumed. The Company is reviewing the valuation and confirming the results to determine the final purchase price allocations during the measurement period. The provisional amounts are subject to revision until the evaluations are completed to the extent that additional information is obtained about the facts and circumstances that existed as of the acquisition date. Any changes to the fair value assessments will affect the gain on bargain purchase. Therefore, the final purchase price allocations may differ significantly from what is reflected in these condensed consolidated financial statements.
	Pro forma results of operations and other disclosures for the Siltech acquisition have not been presented as they are not material in relation to the Company’s reported results.
	Step Acquisition:
	On December 20, 2012, the Company closed its stock purchase of the remaining 50% interest in an existing equity investment. The total purchase price was $5,000, of which $4,500 was financed using cash on hand and the remaining $500 is subject to the finalization of the working capital settlement. The Company recognized a gain of approximately $1,655 on the fair value remeasurement (based on the transaction price) of its existing 50% equity investment.  The Company finalized the purchase price allocation in December 2013, recorded $3,371 of goodwill in connection with the acquisition, which was assigned to the GMI operating segment.

Inventories

Inventories	9 Months Ended
	Mar. 31, 2014
Inventories [Abstract]	'
Inventories	'
	(4)             Inventories
	Inventories comprise the following:
				March 31,	June 30,
				2014	2013
	Finished goods		$	25,589	35,015
	Work in process			11,455	4,133
	Raw materials			28,445	47,919
	Parts and supplies			11,678	14,130
		Total	$	77,167	101,197
	At March 31, 2014, $69,730 in inventory is valued using the first-in, first-out method and $7,437 using the average cost method. At June 30, 2013, $93,320 in inventory is valued using the first-in, first-out method and $7,877 using the average cost method.

Property_Plant_and_Equipment

Property, Plant, and Equipment	9 Months Ended
	Mar. 31, 2014
Property, Plant, and Equipment [Abstract]	'
Property, Plant, and Equipment	'
	(5)             Property, Plant, and Equipment
	Property, plant, and equipment, net, comprise the following:
				March 31,	June 30,
				2014	2013
	Land, land improvements, and land use rights		$	13,578	9,085
	Building and improvements			87,008	87,486
	Machinery and equipment			207,924	196,915
	Furnaces			206,526	202,444
	Mineral reserves			55,843	55,843
	Mine development			6,806	4,863
	Other			13,358	11,279
	Construction in progress			51,822	6,786
		Property, plant, and equipment, gross		642,865	574,701
	Less accumulated depreciation, depletion and amortization			(184,721)	(152,254)
		Property, plant, and equipment, net	$	458,144	422,447
	Depreciation, depletion and amortization expense for the three and nine months ended March 31, 2014 was $11,244 and $33,931, of which $10,977 and $33,127 is recorded in cost of goods sold and $267 and $804 is recorded in selling, general, and administrative expenses, respectively. Depreciation, depletion and amortization expense for the three and nine months ended March 31, 2013 was $11,488 and $34,721, of which $11,119 and $33,988 is recorded in cost of goods sold and $369 and $733 is recorded in selling, general, and administrative expenses, respectively.
	Capitalized interest for the three and nine months ended March 31, 2014 was $0 and $103, respectively.  Capitalized interest for the three and nine months ended March 31, 2013 was $9 and $9, respectively.
	Mineral reserves are recorded at fair value at the date of acquisition. Mineral reserves are included in “Property, plant and equipment, net of accumulated depreciation, depletion and amortization” on the consolidated balance sheets. Depletion of mineral reserves is computed using the units-of-production method utilizing only proven and probable reserves (as adjusted for recoverability factors) in the depletion base.

Goodwill_and_Other_Intangibles

Goodwill and Other Intangibles	9 Months Ended
	Mar. 31, 2014
Goodwill and Other Intangibles [Abstract]	'
Goodwill and Other Intangibles	'
	(6)             Goodwill and Other Intangibles
	Goodwill and other intangibles presented below have been allocated to the Company’s operating segments.
	a. Goodwill
	Changes in the carrying amount of goodwill, by reportable segment, during the nine months ended March 31, 2014 are as follows:
					Globe
				GMI	Metales	Solsil	Other	Total
	Goodwill		$	34,734	14,313	57,656	7,260	113,963
	Accumulated impairment loss			—	(6,000)	(57,656)	(7,130)	(70,786)
		Balance at June 30, 2013		34,734	8,313	—	130	43,177
	Goodwill			34,734	14,313	57,656	7,260	113,963
	Accumulated impairment loss			—	(6,000)	(57,656)	(7,130)	(70,786)
	Purchase price allocation adjustments			166	—	—	—	166
		Balance at March 31, 2014	$	34,900	8,313	—	130	43,343
	b. Other Intangible Assets
	There were no changes in the value of the Company’s indefinite lived intangible assets during the nine months ended March 31, 2014 and 2013.
	c. Annual Impairment Tests
	The Company performed its annual goodwill and indefinite-lived intangible asset tests during the quarter ended March 31, 2014. A test is also performed whenever events or changes in circumstances indicate the carrying amount of goodwill may not be recoverable. Impairment is the condition that exists when the carrying amount of goodwill exceeds its implied fair value. The implied fair value of goodwill is determined in the same manner as the amount of goodwill recognized in a business combination. The excess of the fair value of a reporting unit over the amounts assigned to its assets and liabilities is the implied fair value of goodwill. An impairment loss would be recognized when the carrying amount of goodwill exceeds the implied fair value of goodwill of the reporting unit. Fair value is measured based on a discounted cash flow method, using a discount rate determined by the Company to be commensurate with the risk inherent in its current business model, or a valuation technique based on multiples of earnings consistent with the objective of measuring fair value. The estimates of cash flows, future earnings, and discount rate are subject to change due to the economic environment and business trends, including such factors as raw material and product pricing, interest rates, expected market returns and volatility of markets served, as well as our future manufacturing capabilities, government regulation and technological change. The Company believes that the estimates of future cash flows, future earnings, and fair value are reasonable; however, changes in estimates, circumstances or conditions could have a significant impact on its fair valuation determination, which could then result in a material impairment charge in the Company’s results of operations.
	As of February 28, 2014, all reporting units had fair values that exceeded carrying values and no impairment charge was required.

Debt

Debt	9 Months Ended
	Mar. 31, 2014
Debt [Abstract]	'
Debt	'
	(7)             Debt
	a. Short-Term Debt
	Short-term debt comprises the following:
						Weighted
					Outstanding	Average		Unused
					Balance	Interest Rate		Credit Line
	March 31, 2014:
	Type debt:
		Export financing		$	—	NA	$	9,269
		Other			15	7.00%		—
			Total	$	15		$	9,269
	June 30, 2013:
	Type debt:
		Export financing		$	—	NA	$	9,690
		Other			284	7.00%		—
			Total	$	284		$	9,690
	Export Financing Agreements – The Company’s Argentine subsidiary maintains various short-term export financing agreements. Generally, these arrangements are for periods ranging between seven and eleven months, and require the Company to pledge as collateral certain export receivable.
	b. Revolving Credit Agreements
	A summary of the Company’s revolving credit agreements at March 31, 2014 is as follows:
						Weighted
					Outstanding	Average		Unused	Total
					Balance	Interest Rate		Commitment	Commitment
	Revolving multi-currency credit facility			$	125,000	1.67%	$	174,060	300,000
	Revolving credit agreement				—	5.00%		13,571	13,571
	Revolving credit facility				—	2.31%		20,000	20,000
	On August 20, 2013, the Company entered into a $300,000 five-year revolving multi-currency credit facility, which includes a $10,000 sublimit for swing line loans and a $25,000 sublimit letter of credit facility. The credit facility refinanced existing debt under the revolving multi-currency credit agreement dated May 31, 2012 and closing costs. The credit facility currently provides up to an additional $174,060 of borrowing capacity as of March 31, 2014. At the Company’s election, the credit facility may be increased by an amount up to $150,000 in the aggregate; such increase may be in the form of term loans or increases in the revolving credit line, subject to lender commitments and certain conditions as described in the credit agreement. The agreement contains provisions for adding domestic and foreign subsidiaries of the Company as additional borrowers under the credit facility. The agreement terminates on August 20, 2018 and requires no scheduled prepayments before that date. The Company classifies borrowings under this credit facility as long-term liabilities.
	Interest on borrowings under the multi-currency credit facility is payable, at the Company’s election, at either (a) a base rate (the higher of (i) the U.S. federal funds rate plus 0.50% per annum, (ii) the Administrative Agent’s prime rate or (iii) a Eurocurrency Rate for loans with a one month interest period plus 1.00% per annum plus a margin ranging from 0.50% to 1.50% per annum (such margin determined by reference to the leverage ratio set forth in the credit agreement), or (b) the Eurocurrency Rate plus a margin ranging from 1.50% to 2.50% per annum (such margin determined by reference to the leverage ratio set forth in the credit agreement). Certain commitment fees are also payable under the credit agreement. The credit agreement contains various covenants. They include, among others, a maximum net debt to earnings before income tax, depreciation and amortization ratio and a minimum interest coverage ratio. The credit facility is guaranteed by certain of the Company’s domestic subsidiaries (the “Guarantors”). Borrowings under the credit agreement are collateralized by the assets of the Company and the Guarantors, including certain real property, equipment, accounts receivable, inventory and the stock of certain of the Company’s and the Guarantors’ subsidiaries. The Company was in compliance with the loan covenants at March 31, 2014.
	At March 31, 2014, there was a $125,000 balance outstanding on the revolving multi-currency credit facility. The total commitment outstanding on this credit facility includes $640 outstanding letters of credit associated with landlord guarantees and $300 outstanding letters of credit associated with economic development.
	On October 1, 2010, the Company entered into a revolving credit facility, which was amended on March 5, 2012 and further amended on June 30, 2013. The amended agreement provides for a $20,000 revolving credit facility. As of March 31, 2014, there was no outstanding balance under the facility. Interest on advances under the revolving credit facility accrues at LIBOR plus an applicable margin percentage or, at the Company’s option, prime plus an applicable margin percentage. The credit facility is subject to certain restrictive and financial covenants, which include limits on additional debt, a maximum ratio of debt to earnings before interest, taxes, depreciation and amortization and a minimum net worth. The Company was in compliance with the loan covenants at March 31, 2014. The Company classifies borrowings under this revolving credit facility as current liabilities as the arrangement is payable in full upon the earlier of 10 business days following written demand by the lender or the agreement’s expiration on December 31, 2014.
	The Company’s subsidiary, Quebec Silicon, entered into a revolving credit agreement dated October 1, 2010, amended on November 23, 2011 and further amended and restated on September 20, 2012, which provides for up to $15,000 Canadian Dollars to fund Quebec Silicon’s working capital requirements. Funding under the revolving credit agreement is available upon request at any time, up to the full amount of the unused credit commitment and subject to continued compliance with the terms of the agreement. Interest on borrowings under the credit agreement is payable at a variable rate of Canadian prime plus 2.00% (5.00% at March 31, 2014), payable quarterly. The credit agreement expires on September 20, 2015, and may be terminated earlier, at the lender’s discretion subject to certain change in ownership conditions being met. All of Quebec Silicon’s assets, properties and revenues have been pledged as security for Quebec Silicon’s obligations under the revolving credit agreement. As of March 31, 2014, there was no outstanding balance under the facility.
	c. Fair Value of Debt
	The recorded carrying values of our debt balances approximate fair value given our debt is at variable rates tied to market indicators or is short-term in nature.

Derivative_Instruments

Derivative Instruments	9 Months Ended
	Mar. 31, 2014
Derivative Instruments [Abstract]	'
Derivative Instruments	'
	(8)             Derivative Instruments
	The Company enters into derivative instruments to hedge certain interest rate, currency, and commodity price risks. The Company does not engage in interest rate, currency, or commodity speculation, and no derivatives are held for trading purposes. All derivatives are accounted for using mark-to-market accounting. The Company believes it is not practical to designate its derivative instruments as hedging instruments as defined under ASC Subtopic 815-10, Derivatives and Hedging (ASC 815). Accordingly, the Company adjusts its derivative financial instruments to current market value through the condensed consolidated statement of operations based on the fair value of the agreement as of period end. Although not designated as hedged items as defined under ASC 815, these derivative instruments serve to significantly offset the Company’s interest rate, currency, and commodity risks. Gains or losses from these transactions offset gains or losses on the assets, liabilities, or transactions being hedged. No credit loss is anticipated as the counterparties to these agreements are major financial institutions that are highly rated.
	Interest Rate Risk:
	The Company is exposed to market risk from changes in interest rates on certain of its short-term and long-term debt obligations. The Company currently has no interest rate derivatives to reduce exposure to interest rate fluctuations.
	Foreign Currency Risk:
	The Company is exposed to market risk arising from changes in currency exchange rates as a result of its operations outside the United States, principally in Argentina, China and Canada. A portion of the Company’s net sales generated from its non-U.S. operations is denominated in currencies other than the U.S. dollar. Most of the Company’s operating costs for its non-U.S. operations are denominated in local currencies, principally the Canadian dollar, Argentine peso and the Chinese renminbi. Consequently, the translated U.S. dollar value of the Company’s non-U.S. dollar net sales, and related accounts receivable balances, and its operating costs are subject to currency exchange rate fluctuations. Derivative instruments are not used extensively to manage this risk. At March 31, 2014, the Company had no outstanding foreign exchange forward and option contracts.
	Commodity Price Risk:
	The Company is exposed to price risk for certain raw materials and energy used in its production process. The raw materials and energy that the Company uses are largely commodities subject to price volatility caused by changes in global supply and demand and governmental controls. Derivative financial instruments are not used extensively to manage the Company’s exposure to fluctuations in the cost of commodity products used in its operations. The Company attempts to reduce the impact of increases in its raw material and energy costs by negotiating long-term contracts and through the acquisition of companies or assets for the purpose of increasing its access to raw materials with favorable pricing terms.
	In October 2010, the Company entered into a power hedge agreement on an 87,600 MWh notional amount of electricity for power required by its Niagara Falls, New York plant not supplied by the facility’s long-term power contract over the term of the hedge agreement. The notional amount decreased equally per month from the agreement’s July 1, 2012 effective date through its expiration on June 30, 2013. Under this power agreement, the Company fixed the power rate at $39.95 per MWh over the life of the contract.
	The effect of the Company’s derivative instruments on the condensed consolidated statements of operations is summarized in the following table:
		(Loss) Recognized		(Loss) Gain Recognized
		During the Three Months		During the Nine Months
		Ended March 31,		Ended March 31,		Location
		2014	2013	2014	2013	of (Loss) Gain
	Foreign exchange forward and option contracts	—	(99)	(603)	(303)	Foreign exchange loss
	Power hedges	—	213	—	394	Cost of goods sold
	The fair values of the Company’s derivative instruments at March 31, 2014 are summarized in note 15 (Fair Value Measurements). The Company held no foreign exchange option contracts or power hedges at March 31, 2014.

Benefit_Plans

Benefit Plans	9 Months Ended
	Mar. 31, 2014
Benefit Plans [Abstract]	'
Benefit Plans	'
	(9)           Benefit Plans
	a. Defined Benefit Retirement Plan
	The Company’s subsidiary, Globe Metallurgical Inc. (GMI), sponsors three noncontributory defined benefit pension plans covering certain domestic employees. These plans were frozen in 2003. The Company’s subsidiary, Core Metals, sponsors a noncontributory defined benefit pension plan covering certain domestic employees. This plan was closed to new participants in April 2009. The Company’s subsidiary, Quebec Silicon, sponsors a contributory defined benefit pension plan. This plan was closed to new participants in December 2013.
	The components of net periodic pension expense for the Company’s defined benefit pension plans are as follows:
			Three Months Ended			Nine Months Ended
			March 31,			March 31,
			2014	2013		2014	2013
	Interest cost	$	682	802	$	2,210	2,411
	Service cost		236	601		1,138	1,809
	Expected return on plan assets		(667)	(631)		(2,028)	(1,897)
	Amortization of net loss		310	385		937	1,154
	Net periodic pension expense	$	561	1,157	$	2,257	3,477
	The Company expects to make required and discretionary contributions of approximately $2,779 to the plans for the fiscal year ending June 30, 2014, of which $2,312 has been contributed through March 31, 2014.
	The active unionized employee members of the bargaining unit of Quebec Silicon who, prior to January 1, 2014, participated in the defined benefit pension plan and/or the defined contribution plan, will begin participating in the RRFS-FTQ (Membership Funded Pension Plan – Federation of Quebec Workers) beginning January 1, 2014. Membership in the defined benefit pension plan will be frozen as of December 31, 2013. No new members may join the defined pension benefit plan as of January 1, 2014. However, the defined benefit pension plan will be maintained in effect. The benefit formula under the defined benefit pension plan for pensionable service after January 1, 2014 will be 0.01% of final average compensation up to the final average maximum pensionable earnings plus 0.012% of final average compensation in excess of the final average maximum pensionable earnings, multiplied by the years and months of completed service pensionable.
	b. Defined Postretirement Benefit Plan
	The Company’s subsidiary, Quebec Silicon, sponsors a postretirement benefit plan for certain employees, based on length of service and remuneration. Postretirement benefits consist of a group insurance plan covering plan members for life insurance, disability, hospital, medical, and dental benefits.
	On December 27, 2013, the Communications, Energy and Paper Workers Union of Canada (“CEP”) ratified a new collective bargaining agreement, which resulted in a curtailment pertaining to the closure of the postretirement benefit plan for union employees retiring after January 31, 2016. The Company remeasured the benefit obligations reflecting the curtailment which resulted in a curtailment gain of $5,831. The curtailment gain is included in operating loss for the nine months ended March 31, 2014.

Income_Taxes

Income Taxes	9 Months Ended
	Mar. 31, 2014
Income Taxes [Abstract]	'
Income Taxes	'
	(10)           Income Taxes
	The provision for income taxes is based on the current estimate of the annual effective tax rate, adjusted as necessary for quarterly events. In accordance with ASC Topic 740, Income Taxes — Accounting for Income Taxes in Interim Periods, the Company’s quarterly effective tax rate does not reflect a benefit associated with losses related to certain foreign subsidiaries. The effective tax rates for the nine months ended March 31, 2014 and 2013 were based on our forecasted annualized effective tax rates, adjusted for discrete items that occurred within the respective periods.
	The Company’s effective tax rate for the nine months ended March 31, 2014 was a tax benefit of 38.6% compared to a tax benefit of 5.9% for the nine months ended March 31, 2013. The increase in the effective tax rate is primarily due to the gain on bargain purchase recorded in connection with the acquisition of Siltech (see note 3), on which no tax has been provided. The estimated annual effective tax expense rate excluding discrete items is 35.0%.
	The Company maintains valuation allowances where it is more likely than not that all or a portion of a deferred tax asset will not be realized. In determining whether a valuation allowance is warranted, the Company evaluates factors such as prior earnings history, expected future earnings, carry back and carry forward periods, and tax strategies that could potentially enhance the likelihood of the realization of a deferred tax asset. During the nine months ended March 31, 2014, the Company’s net valuation allowances increased by $1,300, primarily due to the establishment of additional valuation allowances against net operating losses (NOLs) in our foreign jurisdictions where it is more likely than not the NOLs will not be utilized.
	The Company files a consolidated U.S. income tax return and tax returns in various state and local jurisdictions. Our subsidiaries also file tax returns in various foreign jurisdictions. The Company’s principal jurisdictions include the U.S., Argentina, Canada, Poland, and China. A number of years may elapse before a tax return is audited and finally resolved. The open tax years subject to examination varies depending on the tax jurisdiction. The Company’s major taxing jurisdictions and the related open tax years subject to examination are as follows: the U.S. from 2011 to present, Canada from 2012 to present, Argentina from 2008 to present, and China from 2008 to present.
	The Company regularly evaluates its tax positions for additional unrecognized tax benefits and associated interest and penalties, if applicable. There are many factors that are considered when evaluating these tax positions including: interpretation of tax laws, recent tax litigation on a position, past audit or examination history, and subjective estimates and assumptions that have been deemed reasonable by management. However, if management’s estimates are not representative of actual outcomes, the Company’s results could be materially impacted. There were no material changes in the Company’s uncertain tax positions during the nine months ended March 31, 2014.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Mar. 31, 2014
Commitments and Contingencies [Abstract]	'
Commitments and Contingencies	'
	(11)             Commitments and Contingencies
	a. Legal Contingencies
	The Company is subject to various lawsuits, investigations, claims, and proceedings that arise in the normal course of business, including, but not limited to, employment, commercial, environmental, safety, and health matters, as well as claims associated with its historical acquisitions and divestitures. Although it is not presently possible to determine the outcome of these matters, in the opinion of management, the ultimate disposition of these matters will not have a material adverse effect on the Company’s consolidated financial position, results of operations, or liquidity.
	b. Environmental Contingencies
	It is the Company’s policy to accrue for costs associated with environmental assessments, remedial efforts, or other environmental liabilities when it becomes probable that a liability has been incurred and the costs can be reasonably estimated. When a liability for environmental remediation is recorded, such amounts will be recorded without giving effect to any possible future recoveries. At March 31, 2014, there are no significant liabilities recorded for environmental contingencies. With respect to the cost for ongoing environmental compliance, including maintenance and monitoring, such costs are expensed as incurred unless there is a long-term monitoring agreement with a governmental agency, in which case a liability is established at the inception of the agreement.
	c. Employee Contracts
	As of March 31, 2014, there are 178 employees that are covered by union agreements expiring within one year.
	d. Contract Acquisition Cost
	During the nine months ended March 31, 2014, the Company acquired a supply arrangement that resulted in a payment of $14,400, which impacted operating income (loss) for the period.
	e. Contractual Obligations
	The Company has minimum power charges that are enforceable and legally binding, and do not represent total anticipated purchases. Minimum charge requirements expire after providing one year notice of contract cancellation. The annual minimum charge for the fiscal year ending June 30, 2014 and for each of the four subsequent years is approximately $15,817. The Company has outstanding purchase obligations with suppliers for raw materials in the normal course of business. These purchase obligation amounts represent only those items which are based on annual agreements that are enforceable and legally binding, and do not represent total anticipated purchases. The purchase obligation for the fiscal year ending June 30, 2014 is approximately $24,855.

Stockholders_Equity

Stockholders' Equity	9 Months Ended
	Mar. 31, 2014
Stockholders' Equity [Abstract]	'
Stockholders' Equity	'
	(12)             Stockholders’ Equity
	Dividend
	On August 20, 2013, the Company’s Board of Directors approved an annual dividend of $0.275 per common share, payable quarterly in September 2013, December 2013, March 2014 and June 2014. The September 2013 quarterly dividend of $0.06875 per share, totaling $5,178, was paid on September 24, 2013 to shareholders of record at the close of business on September 10, 2013.  The December 2013 quarterly dividend of $0.06875 per share, totaling $5,178, was paid on December 23, 2013 to shareholders of record at the close of business on December 9, 2013.  On February 10, 2014, the Company’s Board of Directors approved an increase to the annual dividend to $0.300 per common share, payable quarterly in March 2014, June 2014, September 2014, and December 2014.  The March 2014 quarterly dividend of $0.075 per share, totaling $5,559, was paid on March 12, 2014 to shareholders of record at the close of business on February 26, 2014.
	Treasury Stock
	On December 13, 2013, the Company’s Board of Directors approved a share repurchase program that authorized the Company to repurchase up to $75,000 of the Company’s common stock valid through December 31, 2014. The program did not obligate the Company to acquire any particular amount of shares. As of March 31, 2014, 1,465,914 shares were repurchased at an aggregated cost of $26,614.

Earnings_Loss_Per_Share

Earnings (Loss) Per Share	9 Months Ended
	Mar. 31, 2014
Earnings (Loss) Per Share [Abstract]	'
Earnings (Loss) Per Share	'
	(13)             Earnings (Loss) Per Share
	Basic earnings (loss) per common share are calculated based on the weighted average number of common shares outstanding during the three and nine months ended March 31, 2014 and 2013, respectively. Diluted earnings (loss) per common share assumes the exercise of stock options or the vesting of restricted stock grants, provided in each case the effect is dilutive.
	The reconciliation of the amounts used to compute basic and diluted earnings (loss) per common share for the three and nine months ended March 31, 2014 and 2013 is as follows:
			Three Months Ended			Nine Months Ended
			March 31,			March 31,
			2014	2013		2014	2013
	Basic earnings (loss) per share computation
	Numerator:
	Net income (loss) attributable to Globe Specialty Metals, Inc.	$	1,561	(40,135)	$	8,182	(30,772)
	Denominator:
	Weighted average basic shares outstanding		74,291,202	75,301,549		74,963,601	75,174,392
	Basic earnings (loss) per common share	$	0.02	(0.53)	$	0.11	(0.41)
	Diluted earnings (loss) per share computation
	Numerator:
	Net income (loss) attributable to Globe Specialty Metals, Inc.	$	1,561	(40,135)	$	8,182	(30,772)
	Denominator:
	Weighted average basic shares outstanding		74,291,202	75,301,549		74,963,601	75,174,392
	Effect of dilutive securities		143,578	—		106,553	—
	Weighted average diluted shares outstanding		74,434,780	75,301,549		75,070,154	75,174,392
	Diluted earnings (loss) per common share	$	0.02	(0.53)	$	0.11	(0.41)
	Potential common shares associated with outstanding stock options totaling 881,192 and 273,046 for the three months ended March 31, 2014 and 2013, respectively, and 289,443 and 398,958 for the nine months ended March 31, 2014 and 2013, respectively, were excluded from the calculation of diluted earnings per common share because their effect would be anti-dilutive.

ShareBased_Compensation

Share-Based Compensation	9 Months Ended
	Mar. 31, 2014
Share-Based Compensation [Abstract]	'
Share-Based Compensation	'
	(14)             Share-Based Compensation
	a. Stock Plan
	The Company’s share-based compensation program consists of the Globe Specialty Metals, Inc. 2006 Employee, Director and Consultant Stock Plan (the Stock Plan). The Stock Plan was initially approved by the Company’s stockholders on November 10, 2006, and was amended and approved by the Company’s stockholders on December 6, 2010 to increase by 1,000,000 the number of shares of common stock authorized for issuance under the Stock Plan. The Stock Plan, as amended, provides for the issuance of a maximum of 6,000,000 shares of common stock for the granting of incentive stock options, nonqualified options, stock grants, and share-based awards. Any remaining shares available for grant, but not yet granted, will be carried over and used in the following fiscal years.
	On August 17, 2012, the Board authorized the Company to offer to amend certain outstanding options representing the right to purchase shares issued to directors, officers and current employees pursuant to the Stock Plan, to permit these options alternatively to be settled for cash or exercised for the issuance of shares, at the election of the option holder. This modification of the outstanding options changed its classification from equity awards to liability awards and the fair value of the liability awards is remeasured at the end of each reporting period through settlement. These certain outstanding options were further amended during fiscal year 2014 to provide exclusively for cash settlement equal to the positive difference between the fair market value per share on the date of exercise and the exercise price per share. These amended awards are excluded from the weighted average diluted shares outstanding calculation in note 13 (Earnings (Loss) Per Share) as these awards were settled in cash during the quarter.
	At March 31, 2014, there were 231,651 shares available for grant. All option grants have maximum contractual terms ranging from 5 to 10 years.
	During the nine months ended March 31, 2014, share-based compensation awards consisted of the issuance of 2,689,211 nonqualified stock options and 6,615 restricted stock grants.  The grants were offset by forfeiture of 2,447,500 nonqualified stock options.  The forfeited stock options during the nine months ended March 31, 2014 were a result of the certain employees and directors forfeiting their stock options in return for stock appreciation rights that settle exclusively in cash and are no longer part of the Stock Plan.  All of the forfeited share options were fully vested.  Please see below within the Stock Appreciation Rights for further detail over the forfeited stock options that have been converted to stock appreciation rights. A summary of the changes in options outstanding under the Stock Plan during the nine months ended March 31, 2014 is presented below:
					Weighted-
					Average
				Weighted-	Remaining		Aggregate
		Number of		Average	Contractual		Intrinsic
		Options		Exercise Price	Term in Years		Value
	Outstanding as of June 30, 2013	3,795,252	$	8.74	1.79	$	17,452
	Granted	2,689,211		19.36
	Exercised	-33,334		6.24
	Forfeited and converted to SARs	-2,447,500		4.06
	Outstanding as of March 31, 2014	4,003,629	$	18.75	4.17	$	8,745
	Exercisable as of March 31, 2014	908,749	$	17.21	2.86	$	3,739
	The Company estimates the fair value of grants using the Black-Scholes option pricing model. The following assumptions were used to estimate the fair value of stock options issued and remeasured for the nine months ended and as of March 31, 2014:
			2014
	Risk-free interest rate		0.12 to 1.70%
	Expected dividend yield		1.41 to 2.21%
	Expected volatility		24.94 to 47.79%
	Expected term (years)		0.75 to 5.0
	The risk-free interest rate is based on the yield of zero coupon U.S. Treasury bonds with terms similar to the expected term of options. The expected dividend yield is estimated over the expected life of the options based on our historical annual dividend activity. The expected volatility reflects movements in our stock price over the most recent historical period equivalent to the expected life of the options. However, since historical trading data related to the Company’s common stock does not exceed the expected life of certain options, the expected volatility over the term of those options is estimated using the historical volatilities of similar companies.  The expected forfeiture rate is zero as anticipated forfeitures that are not transferred to another share-based compensation plan are estimated to be minimal based on historical data.  The expected term is based on historical and estimated exercise behavior.
	During the nine months ended March 31, 2014, 175,717 options vested, resulting in total vested options of 908,749. There are 3,094,880 unvested options outstanding at March 31, 2014.
	For the three and nine months ended March 31, 2014, pre-tax share-based compensation expense was $1,448 and $13,421, respectively. For the three and nine months ended March 31, 2013, pre-tax share-based compensation expense was $873 and $21,514, respectively. The expense is reported within selling, general, and administrative expenses.  The $4,631 liability associated with share-based compensation awards at March 31, 2014 is included in stock compensation accrual.
	b. Executive Bonus Plan
	In addition to share-based awards issued under the Stock Plan, the Company issues restricted stock units under the Company’s Executive Bonus Plan. These restricted stock units proportionally vest over three years, but are not delivered until the end of the third year. The Company will settle these awards by cash transfer, based on the Company’s stock price on the date of transfer. During the nine months ended March 31, 2014, there were 32,204 restricted stock units granted, 35,225 restricted stock units were exercised, and as of March 31, 2014, 631,020 restricted stock units were outstanding. For the three and nine months ended March 31, 2014, pre-tax compensation expense for these restricted stock units was $2,076 and $6,196, respectively. The expense is reported within selling, general, and administrative expenses. Of the $8,726 liability associated with these restricted stock units at March 31, 2014, $7,360 is included in stock compensation accrual and $1,366 is included in other long-term liabilities.
	c. Stock Appreciation Rights
	The Company issues cash-settled stock appreciation rights as an additional form of incentivized bonus. During the nine months ended March 31, 2014 there were 2,447,500 stock appreciation rights issued.  The stock appreciation rights were issued as a result of forfeitures of stock options in return for stock appreciation rights. These stock appreciation rights were fully vested and exercisable upon grant and had maximum contractual terms of five years.  All 2,447,500 of these awards were exercised during the period and none were outstanding as of March 31, 2014.  Other stock appreciation rights vest and become exercisable in one-third increments over three years. The Company will settle all awards by cash transfer, based on the difference between the Company’s stock price on the date of exercise and the date of grant. During the nine months ended March 31, 2014, there were 3,793,186 stock appreciation rights granted, inclusive of the 2,447,500 stock appreciation rights above, and as of March 31, 2014, 1,345,686 stock appreciation rights were outstanding. For the three and nine months ended March 31, 2014, pre-tax compensation expense for these stock appreciation rights was $6,253 and $13,811, respectively. The expense is reported within selling, general, and administrative expenses.  Of the $2,122 liability associated with these stock appreciation rights at March 31, 2014, none is included in stock compensation accrual and $2,122 is included in other long-term liabilities.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Mar. 31, 2014
Fair Value Measurements [Abstract]	'
Fair Value Measurements	'
	(15)             Fair Value Measurements
	ASC 820, Fair Value Measurements, establishes a fair value hierarchy for disclosure of fair value measurements. The fair value framework requires the categorization of assets and liabilities into three levels based upon the assumptions (inputs) used to value the assets or liabilities. Level 1 provides the most reliable measure of fair value, whereas Level 3 generally requires significant management judgment. The three levels are defined as follows:
	Level 1 — Quoted prices in active markets for identical assets or liabilities.
	Level 2 — Observable inputs other than those included in Level 1. For example, quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in inactive markets.
	Level 3 — Unobservable inputs reflecting management’s own assumptions about the inputs used in pricing the asset or liability. For example, cash flow modeling using inputs based on management’s assumptions.
	The Company does not have any assets that are required to be measured at fair value at March 31, 2014.  The following table summarizes liabilities measured at fair value on a recurring basis at March 31, 2014:
				Total	Level 1	Level 2	Level 3
	Liability classified stock options		$	4,631	—	4,631	—
	Restricted stock units			9,286	9,286	—	—
	Stock appreciation rights			2,122	—	2,122	—
		Total	$	16,039	9,286	6,753	—
	The following table summarizes assets measured at fair value on a recurring basis at June 30, 2013:
				Total	Level 1	Level 2	Level 3
	Foreign exchange forward and option contracts		$	251	—	251	—
		Total	$	251	—	251	—
	The following table summarizes liabilities measured at fair value on a recurring basis at June 30, 2013:
				Total	Level 1	Level 2	Level 3
	Liability classified stock options		$	17,208	—	17,208	—
	Restricted stock units			3,379	3,379	—	—
		Total	$	20,587	3,379	17,208	—
	The fair value of restricted stock units is based on quoted market prices of the Company stock at the end of each reporting period.
	See note 14 (Share-Based Compensation) for information regarding the fair value of our liability classified stock options and stock appreciation rights.
	See note 7 (Debt) for information regarding the fair value of our outstanding debt.

Related_Party_Transactions

Related Party Transactions	9 Months Ended
	Mar. 31, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	(16)             Related Party Transactions
	From time to time, the Company enters into transactions in the normal course of business with related parties. Management believes that such transactions are at arm’s length and for terms that would have been obtained from unaffiliated third parties.
	A current and a former member of the board of directors are affiliated with Marco International. During the three and nine months ended March 31, 2014 and 2013, the Company:
		•	Entered into agreements with Marco International to purchase carbon electrodes. Marco International billed $5,481 and $9,416 during the three months ended March 31, 2014 and 2013, respectively, and $11,249 and $31,938 during the nine months ended March 31, 2014 and 2013, respectively, under these agreements. At March 31, 2014 and June 30, 2013, payables to Marco International under these agreements totaled $123 and $0, respectively.
		•	Entered into agreements with Marco International to purchase rare earth minerals. Marco International billed $0 and $0 during the three months ended March 31, 2014 and 2013, respectively, and $378 and $0 during the nine months ended March 31, 2014 and 2013, respectively, under these agreements. At March 31, 2014 and June 30, 2013, payables to Marco International under these agreements totaled $0 and $0, respectively.
		•	Entered into an agreement to sell ferrosilicon to Marco International. Net sales were $124 and $0 during the three months ended March 31, 2014 and 2013, respectively, and $368 and $411 during the nine months ended March 31, 2014 and 2013, respectively, under this agreement. At March 31, 2014 and June 30, 2013, receivables from Marco International under this agreement totaled $62 and $0, respectively.
		•	Entered into an agreement to sell calcium silicon powder to Marco International. Net sales were $1,730 and $332 during the three months ended March 31, 2014 and 2013, respectively, and $3,663 and $1,246 during the nine months ended March 31, 2014 and 2013, respectively, under this agreement. At March 31, 2014 and June 30, 2013, receivables from Marco International under this agreement totaled $1,018 and $0, respectively.

Operating_Segments

Operating Segments	9 Months Ended
	Mar. 31, 2014
Operating Segments [Abstract]	'
Operating Segments	'
	(17)             Operating Segments
	Operating segments are based upon the Company’s management reporting structure and include the following five reportable segments:
		•	GMI — a manufacturer of silicon metal and silicon-based alloys and a provider of specialty metallurgical coal for the silicon metal and silicon-based alloys industries located in North America.
		•	Globe Metales — a manufacturer of silicon-based alloys located in Argentina.
		•	Solsil — a manufacturer of upgraded metallurgical grade silicon metal located in the United States.
		•	Corporate — general corporate expenses, investments, and related investment income.
		•	Other — operations that do not fit into the above reportable segments and are immaterial for purposes of separate disclosure. The operating segments include Yonvey’s electrode production operations as well as Siltech’s silicon alloy production and certain other distribution operations for the sale of silicon metal and silicon-based alloys.
	Each of our reportable segments distributes its products in both its country of domicile, as well as to other international customers. The following presents the Company’s consolidated net sales by product line:
					Three Months Ended					Nine Months Ended
					March 31,					March 31,
					2014		2013			2014		2013
	Silicon metal			$	101,966		112,602		$	274,778		328,098
	Silicon-based alloys				74,818		60,164			205,594		184,760
	Other				19,273		23,079			67,085		63,635
		Total		$	196,057		195,845		$	547,457		576,493
	a. Segment Data
	Summarized financial information for our reportable segments as of and for the three and nine months ended March 31, 2014 and 2013, is shown in the following tables:
			Three Months Ended					Three Months Ended
			March 31,					March 31,
			2014					2013
			Net Sales	Operating Income (Loss)	Income (Loss) Before Income Taxes			Net Sales	Operating Income (Loss)	Income (Loss) Before Income Taxes
	GMI	$	181,749	20,411	19,555		$	185,712	12,635	10,563
	Globe Metales		13,472	2,260	869			10,005	-5,861	-6,481
	Solsil		—	—	—			—	-20,552	-20,552
	Corporate		—	-13,694	-14,172			—	-20,224	-20,687
	Other		3,067	-1,126	-1,406			2,836	-8,177	-8,312
	Eliminations		-2,231	-112	-112			-2,708	-467	-467
		$	196,057	7,739	4,734		$	195,845	-42,646	-45,936
			Nine Months Ended						Nine Months Ended
			March 31,						March 31,
			2014						2013
			Net Sales	Operating Income (Loss)	Income (Loss) Before Income Taxes	Total Assets			Net Sales	Operating Income (Loss)	Income (Loss) Before Income Taxes
	GMI	$	505,225	40,952	38,653	635,271		$	535,249	59,064	56,548
	Globe Metales		38,212	4,754	1,564	71,207			37,843	-3,164	-4,658
	Solsil		—	-32	-32	15,347			—	-20,987	-20,987
	Corporate		—	-46,977	-28,830	370,948			—	-49,960	-51,277
	Other		9,708	-2,805	-3,112	74,617			8,299	-9,941	-10,136
	Eliminations		-5,688	48	48	-338,792			-4,898	-754	-754
		$	547,457	-4,060	8,291	828,598		$	576,493	-25,742	-31,264
	The accounting policies of our operating segments are the same as those disclosed in note 2 (Summary of Significant Accounting Policies) to our June 30, 2013 consolidated financial statements. We evaluate segment performance principally based on operating income (loss).
	b. Geographic Data
	Net sales are attributed to geographic regions based upon the location of the selling unit. Net sales by geographic region for the three and nine months ended March 31, 2014 and 2013 consist of the following:
					Three Months Ended					Nine Months Ended
					March 31,					March 31,
					2014		2013			2014		2013
	United States			$	163,249		154,512		$	464,066		445,889
	Canada				18,364		31,104			40,653		89,264
	Argentina				11,377		7,560			33,309		33,208
	Poland				3,041		2,627			9,186		7,886
	China				26		42			243		246
		Total		$	196,057		195,845		$	547,457		576,493
	Long-lived assets by geographical region at March 31, 2014 and June 30, 2013 consist of the following:
					March 31,		June 30,
					2014		2013
	United States			$	326,212		328,326
	Canada				87,549		95,591
	South Africa				46,091		—
	Argentina				25,749		24,344
	China				15,531		16,955
	Poland				832		885
		Total		$	501,964		466,101
	Long-lived assets consist of property, plant, and equipment, net of accumulated depreciation, depletion and amortization, and goodwill and other intangible assets.
	c. Major Customer Data
The following is a summary of the Company’s major customers and their respective percentages of consolidated net sales for the three and nine months ended March 31, 2014 and 2013:
	Three Months Ended				Nine Months Ended
	March 31,				March 31,
	2014		2013		2014		2013
Dow Corning	19%		17%		18%		19%
Momentive Performance Materials	11%		12%		9%		9%
All other customers	70%		71%		73%		72%
Total	100%		100%		100%		100%
The majority of sales to Dow Corning for the three and nine months ended March 31, 2014 and 2013 are associated with Dow Corning’s 49% ownership interest in WVA Manufacturing, LLC (WVA LLC), and Quebec Silicon Limited Partnership (QSLP).  Sales to Dow Corning and Momentive Performance Materials are included in the GMI segment.
On April 13, 2014, Momentive Performance Materials (MPM) filed for reorganization under Chapter 11 of the federal Bankruptcy Code. The Company has $7,400 of accounts receivable outstanding as of March 31, 2014, of which approximately $2,400 of GMI’s pre-petition claim was subsequently collected. The remaining $5,000 was accorded administrative priority.

Subsequent_Events

Subsequent Events	9 Months Ended
	Mar. 31, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	(18)             Subsequent Events
	On May 2, 2014, the Company’s board of directors approved the quarterly payment of the annual dividend of $0.30 per common share. A quarterly dividend of $0.075 per share will be payable on June 24, 2014 to shareholders of record at the close of business on June 10, 2014.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Mar. 31, 2014
Summary of Significant Accounting Policies [Abstract]	'
Basis of Presentation	'
	a. Basis of Presentation
	In the opinion of the Company’s management, the accompanying condensed consolidated financial statements include all adjustments necessary for a fair presentation in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) of the results for the interim periods presented and such adjustments are of a normal, recurring nature. The accompanying condensed consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2013. There have been no material changes to the Company’s significant accounting policies during the nine months ended March 31, 2014.
Use of Estimates	'
	b. Use of Estimates
	The Company prepares its condensed consolidated financial statements in accordance with U.S. GAAP. The preparation of these financial statements requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, as well as the disclosure of contingent assets and liabilities. The Company based its estimates and judgments on historical experience, known or expected trends and other factors that are believed to be reasonable under the circumstances. Actual results may differ from these estimates.
Revenue Recognition	'
	c. Revenue Recognition
	Revenue is recognized when title, ownership, and risk of loss pass to the customer, all of which occurs when products are delivered to the Company’s customers or when products are picked up by a customer or a customer’s carrier. Written sales terms, including the selling price, are determined at the time of shipment or delivery. We have not experienced credit issues with our customers.
Exploration Costs	'
	d. Exploration Costs
	Costs incurred to maintain current production capacity at a mine and exploration expenditures are charged to operating costs as incurred, including costs related to drilling and study costs incurred.
Recent Accounting Pronouncements	'
	e. Recent Accounting Pronouncements
	In June 2011, the Financial Accounting Standards Board (FASB) amended its accounting guidance on the presentation of comprehensive income in financial statements to improve the comparability, consistency and transparency of financial reporting and to increase the prominence of items that are recorded in other comprehensive income. The new accounting guidance requires entities to report components of comprehensive income in either (1) a continuous statement of comprehensive income or (2) two separate but consecutive statements. The provisions of the guidance were effective as of the beginning of our 2013 fiscal year. Accordingly, we have presented the components of net income (loss) and other comprehensive (loss) income for the three and nine months ended March 31, 2014 and March 31, 2013 as two separate but consecutive statements. In February 2013, the FASB issued guidance that would require an entity to provide enhanced footnote disclosures to explain the effect of reclassification adjustments on other comprehensive income by component and provide tabular disclosure in the footnotes showing the effect of items reclassified from accumulated other comprehensive income on the line items of net income. The provisions of the guidance were effective as of the beginning of our 2014 fiscal year. We have adopted this standard during the current fiscal year. The adoption of this standard did not have any material effect on our consolidated financial condition or results of operations during the current periods.

Business_Combinations_Tables

Business Combinations (Tables)	9 Months Ended
	Mar. 31, 2014
Business Combinations [Abstract]	'
Preliminary Purchase Price Allocation	'
	Based on the preliminary purchase price allocation, the following table summarizes the estimated preliminary fair value amounts of the assets acquired and liabilities assumed at the date of acquisition:
	Net assets acquired:
			Amount
	Current assets	$	2,298
	Property, plant and equipment		46,500
	Accounts payable		(317)
	Accrued expenses		(10,478)
	Deferred tax liabilities		(11,760)
	Gain on bargain purchase		(22,243)
	Cash consideration paid	$	4,000

Inventories_Tables

Inventories (Tables)	9 Months Ended
	Mar. 31, 2014
Inventories [Abstract]	'
Inventories	'
	Inventories comprise the following:
				March 31,	June 30,
				2014	2013
	Finished goods		$	25,589	35,015
	Work in process			11,455	4,133
	Raw materials			28,445	47,919
	Parts and supplies			11,678	14,130
		Total	$	77,167	101,197

Property_Plant_and_Equipment_T

Property, Plant, and Equipment (Tables)	9 Months Ended
	Mar. 31, 2014
Property, Plant, and Equipment [Abstract]	'
Property, Plant, and Equipment, Net	'
	Property, plant, and equipment, net, comprise the following:
				March 31,	June 30,
				2014	2013
	Land, land improvements, and land use rights		$	13,578	9,085
	Building and improvements			87,008	87,486
	Machinery and equipment			207,924	196,915
	Furnaces			206,526	202,444
	Mineral reserves			55,843	55,843
	Mine development			6,806	4,863
	Other			13,358	11,279
	Construction in progress			51,822	6,786
		Property, plant, and equipment, gross		642,865	574,701
	Less accumulated depreciation, depletion and amortization			(184,721)	(152,254)
		Property, plant, and equipment, net	$	458,144	422,447

Goodwill_and_Other_Intangibles1

Goodwill and Other Intangibles (Tables)	9 Months Ended
	Mar. 31, 2014
Goodwill and Other Intangibles [Abstract]	'
Changes in Carrying Amount of Goodwill	'
	Changes in the carrying amount of goodwill, by reportable segment, during the nine months ended March 31, 2014 are as follows:
					Globe
				GMI	Metales	Solsil	Other	Total
	Goodwill		$	34,734	14,313	57,656	7,260	113,963
	Accumulated impairment loss			—	(6,000)	(57,656)	(7,130)	(70,786)
		Balance at June 30, 2013		34,734	8,313	—	130	43,177
	Goodwill			34,734	14,313	57,656	7,260	113,963
	Accumulated impairment loss			—	(6,000)	(57,656)	(7,130)	(70,786)
	Purchase price allocation adjustments			166	—	—	—	166
		Balance at March 31, 2014	$	34,900	8,313	—	130	43,343

Debt_Tables

Debt (Tables)	9 Months Ended
	Mar. 31, 2014
Debt [Abstract]	'
Short-term Debt	'
	Short-term debt comprises the following:
						Weighted
					Outstanding	Average		Unused
					Balance	Interest Rate		Credit Line
	March 31, 2014:
	Type debt:
		Export financing		$	—	NA	$	9,269
		Other			15	7.00%		—
			Total	$	15		$	9,269
	June 30, 2013:
	Type debt:
		Export financing		$	—	NA	$	9,690
		Other			284	7.00%		—
			Total	$	284		$	9,690
Summary of Revolving Credit Agreements	'
	A summary of the Company’s revolving credit agreements at March 31, 2014 is as follows:
						Weighted
					Outstanding	Average		Unused	Total
					Balance	Interest Rate		Commitment	Commitment
	Revolving multi-currency credit facility			$	125,000	1.67%	$	174,060	300,000
	Revolving credit agreement				—	5.00%		13,571	13,571
	Revolving credit facility				—	2.31%		20,000	20,000

Derivative_Instruments_Tables

Derivative Instruments (Tables)	9 Months Ended
	Mar. 31, 2014
Derivative Instruments [Abstract]	'
Gain (Loss) on Derivative Instruments	'
	The effect of the Company’s derivative instruments on the condensed consolidated statements of operations is summarized in the following table:
		(Loss) Recognized		(Loss) Gain Recognized
		During the Three Months		During the Nine Months
		Ended March 31,		Ended March 31,		Location
		2014	2013	2014	2013	of (Loss) Gain
	Foreign exchange forward and option contracts	—	(99)	(603)	(303)	Foreign exchange loss
	Power hedges	—	213	—	394	Cost of goods sold

Benefit_Plans_Tables

Benefit Plans (Tables)	9 Months Ended
	Mar. 31, 2014
Benefit Plans [Abstract]	'
Net Periodic Pension Expense	'
	The components of net periodic pension expense for the Company’s defined benefit pension plans are as follows:
			Three Months Ended			Nine Months Ended
			March 31,			March 31,
			2014	2013		2014	2013
	Interest cost	$	682	802	$	2,210	2,411
	Service cost		236	601		1,138	1,809
	Expected return on plan assets		(667)	(631)		(2,028)	(1,897)
	Amortization of net loss		310	385		937	1,154
	Net periodic pension expense	$	561	1,157	$	2,257	3,477

Earnings_Loss_Per_Share_Tables

Earnings (Loss) Per Share (Tables)	9 Months Ended
	Mar. 31, 2014
Earnings (Loss) Per Share [Abstract]	'
Reconciliation of Earnings (Loss) per Share	'
	The reconciliation of the amounts used to compute basic and diluted earnings (loss) per common share for the three and nine months ended March 31, 2014 and 2013 is as follows:
			Three Months Ended			Nine Months Ended
			March 31,			March 31,
			2014	2013		2014	2013
	Basic earnings (loss) per share computation
	Numerator:
	Net income (loss) attributable to Globe Specialty Metals, Inc.	$	1,561	(40,135)	$	8,182	(30,772)
	Denominator:
	Weighted average basic shares outstanding		74,291,202	75,301,549		74,963,601	75,174,392
	Basic earnings (loss) per common share	$	0.02	(0.53)	$	0.11	(0.41)
	Diluted earnings (loss) per share computation
	Numerator:
	Net income (loss) attributable to Globe Specialty Metals, Inc.	$	1,561	(40,135)	$	8,182	(30,772)
	Denominator:
	Weighted average basic shares outstanding		74,291,202	75,301,549		74,963,601	75,174,392
	Effect of dilutive securities		143,578	—		106,553	—
	Weighted average diluted shares outstanding		74,434,780	75,301,549		75,070,154	75,174,392
	Diluted earnings (loss) per common share	$	0.02	(0.53)	$	0.11	(0.41)

ShareBased_Compensation_Tables

Share-Based Compensation (Tables)	9 Months Ended
	Mar. 31, 2014
Share-Based Compensation [Abstract]	'
Changes in Options Outstanding	'
	A summary of the changes in options outstanding under the Stock Plan during the nine months ended March 31, 2014 is presented below:
					Weighted-
					Average
				Weighted-	Remaining		Aggregate
		Number of		Average	Contractual		Intrinsic
		Options		Exercise Price	Term in Years		Value
	Outstanding as of June 30, 2013	3,795,252	$	8.74	1.79	$	17,452
	Granted	2,689,211		19.36
	Exercised	-33,334		6.24
	Forfeited and converted to SARs	-2,447,500		4.06
	Outstanding as of March 31, 2014	4,003,629	$	18.75	4.17	$	8,745
	Exercisable as of March 31, 2014	908,749	$	17.21	2.86	$	3,739
Assumptions to Estimate Fair Value of Stock Option Awards	'
	The Company estimates the fair value of grants using the Black-Scholes option pricing model. The following assumptions were used to estimate the fair value of stock options issued and remeasured for the nine months ended and as of March 31, 2014:
			2014
	Risk-free interest rate		0.12 to 1.70%
	Expected dividend yield		1.41 to 2.21%
	Expected volatility		24.94 to 47.79%
	Expected term (years)		0.75 to 5.0

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Mar. 31, 2014
Fair Value Measurements [Abstract]	'
Assets Measured on Recurring Basis	'
	The following table summarizes liabilities measured at fair value on a recurring basis at March 31, 2014:
				Total	Level 1	Level 2	Level 3
	Liability classified stock options		$	4,631	—	4,631	—
	Restricted stock units			9,286	9,286	—	—
	Stock appreciation rights			2,122	—	2,122	—
		Total	$	16,039	9,286	6,753	—
	The following table summarizes assets measured at fair value on a recurring basis at June 30, 2013:
				Total	Level 1	Level 2	Level 3
	Foreign exchange forward and option contracts		$	251	—	251	—
		Total	$	251	—	251	—
Liabilities Measured on Recurring Basis	'
	The following table summarizes liabilities measured at fair value on a recurring basis at June 30, 2013:
				Total	Level 1	Level 2	Level 3
	Liability classified stock options		$	17,208	—	17,208	—
	Restricted stock units			3,379	3,379	—	—
		Total	$	20,587	3,379	17,208	—

Operating_Segments_Tables

Operating Segments (Tables)	9 Months Ended
	Mar. 31, 2014
Operating Segments [Abstract]	'
Consolidated Net Sales by Product Line	'
	Each of our reportable segments distributes its products in both its country of domicile, as well as to other international customers. The following presents the Company’s consolidated net sales by product line:
					Three Months Ended					Nine Months Ended
					March 31,					March 31,
					2014		2013			2014		2013
	Silicon metal			$	101,966		112,602		$	274,778		328,098
	Silicon-based alloys				74,818		60,164			205,594		184,760
	Other				19,273		23,079			67,085		63,635
		Total		$	196,057		195,845		$	547,457		576,493
Financial Information for Reportable Segments	'
	Summarized financial information for our reportable segments as of and for the three and nine months ended March 31, 2014 and 2013, is shown in the following tables:
			Three Months Ended					Three Months Ended
			March 31,					March 31,
			2014					2013
			Net Sales	Operating Income (Loss)	Income (Loss) Before Income Taxes			Net Sales	Operating Income (Loss)	Income (Loss) Before Income Taxes
	GMI	$	181,749	20,411	19,555		$	185,712	12,635	10,563
	Globe Metales		13,472	2,260	869			10,005	-5,861	-6,481
	Solsil		—	—	—			—	-20,552	-20,552
	Corporate		—	-13,694	-14,172			—	-20,224	-20,687
	Other		3,067	-1,126	-1,406			2,836	-8,177	-8,312
	Eliminations		-2,231	-112	-112			-2,708	-467	-467
		$	196,057	7,739	4,734		$	195,845	-42,646	-45,936
			Nine Months Ended						Nine Months Ended
			March 31,						March 31,
			2014						2013
			Net Sales	Operating Income (Loss)	Income (Loss) Before Income Taxes	Total Assets			Net Sales	Operating Income (Loss)	Income (Loss) Before Income Taxes
	GMI	$	505,225	40,952	38,653	635,271		$	535,249	59,064	56,548
	Globe Metales		38,212	4,754	1,564	71,207			37,843	-3,164	-4,658
	Solsil		—	-32	-32	15,347			—	-20,987	-20,987
	Corporate		—	-46,977	-28,830	370,948			—	-49,960	-51,277
	Other		9,708	-2,805	-3,112	74,617			8,299	-9,941	-10,136
	Eliminations		-5,688	48	48	-338,792			-4,898	-754	-754
		$	547,457	-4,060	8,291	828,598		$	576,493	-25,742	-31,264
Net Sales by Geographical Region	'
	Net sales are attributed to geographic regions based upon the location of the selling unit. Net sales by geographic region for the three and nine months ended March 31, 2014 and 2013 consist of the following:
					Three Months Ended					Nine Months Ended
					March 31,					March 31,
					2014		2013			2014		2013
	United States			$	163,249		154,512		$	464,066		445,889
	Canada				18,364		31,104			40,653		89,264
	Argentina				11,377		7,560			33,309		33,208
	Poland				3,041		2,627			9,186		7,886
	China				26		42			243		246
		Total		$	196,057		195,845		$	547,457		576,493
Long-lived Assets by Geographical Region	'
	Long-lived assets by geographical region at March 31, 2014 and June 30, 2013 consist of the following:
					March 31,		June 30,
					2014		2013
	United States			$	326,212		328,326
	Canada				87,549		95,591
	South Africa				46,091		—
	Argentina				25,749		24,344
	China				15,531		16,955
	Poland				832		885
		Total		$	501,964		466,101
Major Customers Percentage of Net Sales	'
	The following is a summary of the Company’s major customers and their respective percentages of consolidated net sales for the three and nine months ended March 31, 2014 and 2013:
		Three Months Ended				Nine Months Ended
		March 31,				March 31,
		2014		2013		2014		2013
	Dow Corning	19%		17%		18%		19%
	Momentive Performance Materials	11%		12%		9%		9%
	All other customers	70%		71%		73%		72%
	Total	100%		100%		100%		100%

Business_Combinations_Details

Business Combinations (Details) (USD $)	3 Months Ended		6 Months Ended	9 Months Ended		0 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 20, 2012	Mar. 31, 2014	Mar. 31, 2013	Nov. 21, 2013
						Silicon Technology (Pty), Ltd [Member]
						Mg
Business Acquisition [Abstract]	'	'	'	'	'	'
Percentage of interest acquired (in hundredths)	'	'	'	'	'	100.00%
Annual production capacity of acquiree (in metric tons)	'	'	'	'	'	45,000
Percentage of increase in annual capacity due to opportunistic acquisition (in hundredths)	'	'	'	'	'	30.00%
Fair value of identifiable net assets acquired	'	'	'	'	'	$26,243
Necessary capital expenditures to restart operations	'	'	'	'	'	5,000
Estimated fair values of assets acquired and liabilities assumed at acquisition date [Abstract]	'	'	'	'	'	'
Current assets	'	'	'	'	'	2,298
Property, plant and equipment	'	'	'	'	'	46,500
Accounts payable	'	'	'	'	'	-317
Accrued expenses	'	'	'	'	'	-10,478
Deferred tax liabilities	'	'	'	'	'	-11,760
Gain on bargain purchase	'	'	'	'	'	-22,243
Cash consideration paid	'	'	'	'	'	4,000
Step Acquisition [Abstract]	'	'	'	'	'	'
Step acquisition equity interest (in hundredths)	'	'	50.00%	'	'	'
Step acquisition total purchase Price	'	'	5,000	'	'	'
Step acquisition purchase price, cash paid	'	'	4,500	'	'	'
Amount due under step acquisition	'	'	500	'	'	'
Gain on remeasurement of equity investment	0	170	1,655	0	1,877	'
Step acquisition, goodwill amount	'	'	$3,371	'	'	'

Inventories_Details

Inventories (Details) (USD $)	Mar. 31, 2014	Jun. 30, 2013
In Thousands, unless otherwise specified
Inventories [Abstract]	'	'
Finished goods	$25,589	$35,015
Work in process	11,455	4,133
Raw materials	28,445	47,919
Parts and supplies	11,678	14,130
Total	77,167	101,197
Inventory valued using first-in, first-out method	69,730	93,320
Inventory valued using average cost method	$7,437	$7,877

Property_Plant_and_Equipment_D

Property, Plant, and Equipment (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Jun. 30, 2013
Property, plant and equipment, net [Abstract]	'	'	'	'	'
Property, plant, and equipment, gross	$642,865	'	$642,865	'	$574,701
Less accumulated depreciation, depletion and amortization	-184,721	'	-184,721	'	-152,254
Property, plant, and equipment, net	458,144	'	458,144	'	422,447
Depreciation [Abstract]	'	'	'	'	'
Depreciation, depletion and amortization	11,244	11,488	33,931	34,721	'
Capitalized interest	103	9	103	9	'
Cost of Goods Sold [Member]	'	'	'	'	'
Depreciation [Abstract]	'	'	'	'	'
Depreciation, depletion and amortization	10,977	11,119	33,127	33,988	'
Selling, General and Administrative Expenses [Member]	'	'	'	'	'
Depreciation [Abstract]	'	'	'	'	'
Depreciation, depletion and amortization	267	369	804	733	'
Land, Land Improvements, and Land Use Rights [Member]	'	'	'	'	'
Property, plant and equipment, net [Abstract]	'	'	'	'	'
Property, plant, and equipment, gross	13,578	'	13,578	'	9,085
Building and Improvements [Member]	'	'	'	'	'
Property, plant and equipment, net [Abstract]	'	'	'	'	'
Property, plant, and equipment, gross	87,008	'	87,008	'	87,486
Machinery and Equipment [Member]	'	'	'	'	'
Property, plant and equipment, net [Abstract]	'	'	'	'	'
Property, plant, and equipment, gross	207,924	'	207,924	'	196,915
Furnaces [Member]	'	'	'	'	'
Property, plant and equipment, net [Abstract]	'	'	'	'	'
Property, plant, and equipment, gross	206,526	'	206,526	'	202,444
Mineral Reserves [Member]	'	'	'	'	'
Property, plant and equipment, net [Abstract]	'	'	'	'	'
Property, plant, and equipment, gross	55,843	'	55,843	'	55,843
Mine Development [Member]	'	'	'	'	'
Property, plant and equipment, net [Abstract]	'	'	'	'	'
Property, plant, and equipment, gross	6,806	'	6,806	'	4,863
Other [Member]	'	'	'	'	'
Property, plant and equipment, net [Abstract]	'	'	'	'	'
Property, plant, and equipment, gross	13,358	'	13,358	'	11,279
Construction in Progress [Member]	'	'	'	'	'
Property, plant and equipment, net [Abstract]	'	'	'	'	'
Property, plant, and equipment, gross	$51,822	'	$51,822	'	$6,786

Goodwill_and_Other_Intangibles2

Goodwill and Other Intangibles (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Jun. 30, 2013
Goodwill [Roll Forward]	'	'
Goodwill	$113,963	$113,963
Accumulated impairment loss	-70,786	-70,786
Purchase price allocation adjustments	166	'
Goodwill, net	43,343	43,177
GMI [Member]	'	'
Goodwill [Roll Forward]	'	'
Goodwill	34,734	34,734
Accumulated impairment loss	0	0
Purchase price allocation adjustments	166	'
Goodwill, net	34,900	34,734
Globe Metales [Member]	'	'
Goodwill [Roll Forward]	'	'
Goodwill	14,313	14,313
Accumulated impairment loss	-6,000	-6,000
Purchase price allocation adjustments	0	'
Goodwill, net	8,313	8,313
Solsil [Member]	'	'
Goodwill [Roll Forward]	'	'
Goodwill	57,656	57,656
Accumulated impairment loss	-57,656	-57,656
Purchase price allocation adjustments	0	'
Goodwill, net	0	0
Other [Member]	'	'
Goodwill [Roll Forward]	'	'
Goodwill	7,260	7,260
Accumulated impairment loss	-7,130	-7,130
Purchase price allocation adjustments	0	'
Goodwill, net	$130	$130

Debt_Details

Debt (Details)

Mar. 31, 2014

Jun. 30, 2013

Mar. 31, 2014

Jun. 30, 2013

Aug. 20, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Jun. 30, 2013

Mar. 31, 2014

Jun. 30, 2013

In Thousands, unless otherwise specified

USD ($)

USD ($)

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving multi-currency credit facility [Member]

Revolving multi-currency credit facility [Member]

Revolving credit agreement [Member]

Quebec Silicon Acquisition Revolving Credit Facility [Member]

Export Financing [Member]

Export Financing [Member]

Other [Member]

Other [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

CAD

USD ($)

USD ($)

USD ($)

USD ($)

Short-term Debt [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding Balance

$15

$284

'

'

'

'

'

'

$0

$0

$15

$284

Weighted Average Interest Rate (in hundredths)

'

'

'

'

'

'

'

'

'

'

7.00%

7.00%

Unused Credit Line

9,269

9,690

'

'

'

'

'

'

9,269

9,690

0

0

Period for short-term export financing agreements, minimum (in months)

'

'

'

'

'

'

'

'

'7 months

'

'

'

Period for short-term export financing agreements, maximum (in months)

'

'

'

'

'

'

'

'

'11 months

'

'

'

Line of Credit Facility [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding balance

0

9,000

0

'

'

125,000

0

'

'

'

'

'

Term of credit facility

'

'

'

'

'5 years

'

'

'

'

'

'

'

Weighted average interest rate (in hundredths)

'

'

2.31%

'

'

1.67%

5.00%

'

'

'

'

'

Unused commitment

'

'

20,000

'

'

174,060

13,571

'

'

'

'

'

Total commitment

'

'

20,000

20,000

300,000

300,000

13,571

15,000

'

'

'

'

Expiration date

'

'

'

'

'

20-Aug-18

'

20-Sep-15

'

'

'

'

Sublimit for swingline loans

'

'

'

'

10,000

'

'

'

'

'

'

'

Sublimit letter of credit

'

'

'

'

25,000

'

'

'

'

'

'

'

Interest rate on borrowings under the credit agreement

'

'

'

'

'Interest on borrowings under the multi-currency credit facility is payable, at the Company's election, at either (a) a base rate (the higher of (i) the U.S. federal funds rate plus 0.50% per annum, (ii) the Administrative Agent's prime rate or (iii) a Eurocurrency Rate for loans with a one month interest period plus 1.00% per annum plus a margin ranging from 0.50% to 1.50% per annum (such margin determined by reference to the leverage ratio set forth in the credit agreement), or (b) the Eurocurrency Rate plus a margin ranging from 1.50% to 2.50% per annum (such margin determined by reference to the leverage ratio set forth in the credit agreement).

'

'

'

'

'

'

'

Additional borrowing capacity

'

'

'

'

'

174,060

'

'

'

'

'

'

Aggregate amount by which maximum borrowing capacity may be increased

'

'

'

'

'

150,000

'

'

'

'

'

'

Period following written demand by lender after which borrowings become due and payable (in business days)

'

'

'10 days

'

'

'

'

'

'

'

'

'

Interest rate on borrowings, variable rate basis

'

'

'

'

'

'

'

'Canadian prime

'

'

'

'

Interest rate on borrowings, basis spread on variable rate (in hundredths)

'

'

'

'

'

'

'

2.00%

'

'

'

'

Interest rate at period end (in hundredths)

'

'

'

'

'

'

'

5.00%

'

'

'

'

Letters of credit outstanding associated with landlord guarantees

'

'

'

'

'

640

'

'

'

'

'

'

Letters of credit outstanding associated with economic development

'

'

'

'

'

$300

'

'

'

'

'

'

Derivative_Instruments_Details

Derivative Instruments (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Jun. 30, 2011
	Foreign Exchange Forward and Option contracts [Member]	Foreign Exchange Forward and Option contracts [Member]	Foreign Exchange Forward and Option contracts [Member]	Foreign Exchange Forward and Option contracts [Member]	Power Hedges [Member]	Power Hedges [Member]	Power Hedges [Member]	Power Hedges [Member]	Power Hedge October 2010 [Member]
	Foreign Exchange Loss [Member]	Foreign Exchange Loss [Member]	Foreign Exchange Loss [Member]	Foreign Exchange Loss [Member]	Cost of Goods Sold [Member]	Cost of Goods Sold [Member]	Cost of Goods Sold [Member]	Cost of Goods Sold [Member]	MWh
Derivative [Line Items]	'	'	'	'	'	'	'	'	'
Notional amount of electricity supplied per agreement (in MWh)	'	'	'	'	'	'	'	'	87,600
Fixed power rate, price per MWh	'	'	'	'	'	'	'	'	39.95
Expiration date of agreement	'	'	'	'	'	'	'	'	30-Jun-13
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'	'	'	'	'	'
Gain (loss) recognized	$0	($99)	($603)	($303)	$0	$213	$0	$394	'

Benefit_Plans_Details

Benefit Plans (Details) (USD $)	12 Months Ended		3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014
		Plan	Pension Plans, Defined Benefit [Member]	Pension Plans, Defined Benefit [Member]	Pension Plans, Defined Benefit [Member]	Pension Plans, Defined Benefit [Member]	Defined Benefit Retirement Plan [Member]
Benefit Plans [Abstract]	'	'	'	'	'	'	'
Number of noncontributory defined benefit pension plans	'	3	'	'	'	'	'
Net periodic pension expense [Abstract]	'	'	'	'	'	'	'
Interest cost	'	'	$682	$802	$2,210	$2,411	'
Service cost	'	'	236	601	1,138	1,809	'
Expected return on plan assets	'	'	-667	-631	-2,028	-1,897	'
Amortization of net loss	'	'	310	385	937	1,154	'
Net periodic pension expense	'	'	561	1,157	2,257	3,477	'
Employer contributions [Abstract]	'	'	'	'	'	'	'
Estimated future employer contributions for the current fiscal year	'	'	2,779	'	2,779	'	'
Defined benefit plan contributions by employer	'	'	'	'	2,312	'	'
Net decrease in the pre-tax components of accumulated other comprehensive loss comprising net actuarial curtailment gain	'	'	'	'	'	'	$5,831
Multiplier to determine pensionable service	0.01%	'	'	'	'	'	'
Additional multiplier to determine pensionable	0.01%	'	'	'	'	'	'

Income_Taxes_Details

Income Taxes (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Income Taxes [Abstract]	'	'
Effective income tax rate (in hundredths)	38.60%	5.90%
Annual effective rate excluding discrete items (in hundredths)	35.00%	'
Increase in net valuation allowance	$1,300	'
United States [Member]	'	'
Income Tax Examination [Line Items]	'	'
Open Tax Year Range	'2010 to present	'
Canada [Member]	'	'
Income Tax Examination [Line Items]	'	'
Open Tax Year Range	'2012 to present	'
Argentina [Member]	'	'
Income Tax Examination [Line Items]	'	'
Open Tax Year Range	'2008 to present	'
China [Member]	'	'
Income Tax Examination [Line Items]	'	'
Open Tax Year Range	'2008 to present	'

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Jun. 30, 2013
	Employee
Employee Contracts [Abstract]	'	'
Number of employees covered by union agreements	178	'
Contract Settlement [Abstract]	'	'
Supply arrangement payment	$14,400	'
Contractual Obligation, Fiscal Year Maturity [Abstract]	'	'
Fiscal year 2014	'	15,817
Fiscal year 2015	'	15,817
Fiscal year 2016	'	15,817
Fiscal year 2017	'	15,817
Fiscal year 2018	'	15,817
Purchase obligation due in the next twelve months	'	$24,855

Stockholders_Equity_Details

Stockholders' Equity (Details) (USD $)	3 Months Ended			9 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Mar. 31, 2014
Stockholders' Equity [Abstract]	'	'	'	'
Date dividend declared	10-Feb-14	'	20-Aug-13	'
Dividends payable amount per share in each quarter (in dollars per share)	$0.30	'	$0.28	$0.30
Common stock dividends per share cash paid (in dollars per share)	$0.08	$0.07	$0.07	'
Total dividends paid	$5,559	$5,178	$5,178	'
Date dividends paid	12-Mar-14	23-Dec-13	24-Sep-13	'
Date of stockholders of record	26-Feb-14	9-Dec-13	10-Sep-13	'
Treasury Stock [Abstract]	'	'	'	'
Authorized amount of stock repurchase	'	'	'	75,000
Treasury stock purchased (in shares)	'	'	'	1,465,914
Treasury stock acquired under the repurchase program	'	'	'	$26,614

Earnings_Loss_Per_Share_Detail

Earnings (Loss) Per Share (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Basic earnings (loss) per share computation - numerator [Abstract]	'	'	'	'
Net income (loss) attributable to Globe Specialty Metals, Inc.	$1,561	($40,135)	$8,182	($30,772)
Basic earnings (loss) per share computation - denominator [Abstract]	'	'	'	'
Weighted average basic shares outstanding (in shares)	74,291,202	75,301,549	74,963,601	75,174,392
Basic earnings (loss) per common share (in dollars per share)	$0.02	($0.53)	$0.11	($0.41)
Diluted earnings (loss) per share computation - numerator [Abstract]	'	'	'	'
Net income (loss) attributable to Globe Specialty Metals, Inc.	$1,561	($40,135)	$8,182	($30,772)
Diluted earnings (loss) per share computation - denominator [Abstract]	'	'	'	'
Weighted average basic shares outstanding (in shares)	74,291,202	75,301,549	74,963,601	75,174,392
Effect of dilutive securities (in shares)	143,578	0	106,553	0
Weighted average diluted shares outstanding (in shares)	74,434,780	75,301,549	75,070,154	75,174,392
Diluted earnings (loss) per common share (in dollars per share)	$0.02	($0.53)	$0.11	($0.41)
Stock Options [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Anti-dilutive shares (in shares)	881,192	273,046	298,443	398,958

ShareBased_Compensation_Detail

Share-Based Compensation (Details) (USD $)

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

In Thousands, except Share data, unless otherwise specified

Mar. 31, 2014

Jun. 30, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Selling, General and Administrative Expenses [Member]

Selling, General and Administrative Expenses [Member]

Selling, General and Administrative Expenses [Member]

Selling, General and Administrative Expenses [Member]

Stock Compensation Accrual [Member]

Minimum [Member]

Maximum [Member]

Stock Options [Member]

Restricted Stock Grants [Member]

Non-qualified Stock Option [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Stock Appreciation Rights (SARs) [Member]

Stock Appreciation Rights (SARs) [Member]

Stock Appreciation Rights (SARs) [Member]

Stock Appreciation Rights (SARs) [Member]

Stock Appreciation Rights (SARs) [Member]

Stock Appreciation Rights (SARs) [Member]

Selling, General and Administrative Expenses [Member]

Selling, General and Administrative Expenses [Member]

Stock Compensation Accrual [Member]

Other Long Term Liabilities [Member]

Selling, General and Administrative Expenses [Member]

Selling, General and Administrative Expenses [Member]

Stock Compensation Accrual [Member]

Other Long Term Liabilities [Member]

Maximum [Member]

Stock Plan Activity Since Inception [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase in shares of common stock authorized for issuance under the Plan (in shares)

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares of common stock authorized to be issued (in shares)

6,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares available for grant (in shares)

231,651

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Contractual terms of option grants, minimum

'

'

'

'

'

'

'

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

Contractual terms of option grants, maximum

'

'

'

'

'

'

'

'

'

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based compensation awards issued (in shares)

'

'

'

'

'

'

'

'

'

'

6,615

2,686,211

'

'

'

'

'

'

'

'

'

'

'

Number of Options [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding, beginning of period (in shares)

3,795,252

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Granted (in shares)

2,689,211

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercised (in shares)

-33,334

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Forfeited and converted to SARs (in shares)

-2,447,500

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Forfeited (in shares)

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding, end of period (in shares)

4,003,629

3,795,252

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercisable, end of period (in shares)

908,749

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted-Average Exercise Price [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding, beginning of period (in dollars per share)

$8.74

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Granted (in dollars per share)

$19.36

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercised (in dollars per share)

$6.24

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Forfeited and converted to SARs (in dollars per share)

$4.06

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Forfeited and expired (in dollars per share)

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding, end of period (in dollars per share)

$18.75

$8.74

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercisable, end of period (in dollars per share)

$17.21

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted-Average Remaining Contractual Term in Years [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding, beginning of period

'4 years 2 months 1 day

'1 year 9 months 14 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding, end of period

'4 years 2 months 1 day

'1 year 9 months 14 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercisable, end of period

'2 years 10 months 10 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate Intrinsic Value [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding, beginning of period

$17,452

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding, end of period

8,745

17,452

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercisable, end of period

3,739

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Assumptions used to estimate fair value of stock option awards granted [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Risk free interest rate (in hundredths)

'

'

'

'

'

'

'

0.12%

1.70%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected dividend yield (in hundredths)

'

'

'

'

'

'

'

1.41%

2.21%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected volatility (in hundredths)

'

'

'

'

'

'

'

24.94%

47.79%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected term

'

'

'

'

'

'

'

'0 years 9 months

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Vested in period (in shares)

175,717

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total vested options (in shares)

908,749

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Nonvested options outstanding (in shares)

3,094,880

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share Based Compensation Expense [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based compensation expense

'

'

1,448

873

13,421

21,514

'

'

'

'

'

'

'

2,076

6,196

'

'

'

6,523

13,811

'

'

'

Restricted Stock Units [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Vesting period of award

'

'

'

'

'

'

'

'

'

'

'

'

'3 years

'

'

'

'

'3 years

'

'

'

'

'5 years

Awards granted (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

32,204

'

'

'

'

3,793,186

'

'

'

'

'

Awards exercised (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

35,225

'

'

'

'

2,447,500

'

'

'

'

'

Awards outstanding (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

631,020

'

'

'

'

1,345,686

'

'

'

'

'

Liability associated with share based compensation

'

'

'

'

'

'

$4,631

'

'

'

'

'

$8,726

'

'

$7,360

$1,366

'

'

'

$0

$2,122

'

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (Recurring [Member], USD $)	Mar. 31, 2014	Jun. 30, 2013
In Thousands, unless otherwise specified
Liabilities fair value disclosure [Abstract]	'	'
Liability classified stock options	$4,631	$17,208
Restricted stock units	9,286	3,379
Stock appreciation rights	2,122	'
Total	16,039	20,587
Assets fair value disclosure [Abstract]	'	'
Foreign exchange forward and option contracts	'	251
Total	'	251
Level 1 [Member]	'	'
Liabilities fair value disclosure [Abstract]	'	'
Liability classified stock options	0	0
Restricted stock units	9,286	3,379
Stock appreciation rights	0	'
Total	9,286	3,379
Assets fair value disclosure [Abstract]	'	'
Foreign exchange forward and option contracts	'	0
Total	'	0
Level 2 [Member]	'	'
Liabilities fair value disclosure [Abstract]	'	'
Liability classified stock options	4,631	17,208
Restricted stock units	0	0
Stock appreciation rights	2,122	'
Total	6,753	17,208
Assets fair value disclosure [Abstract]	'	'
Foreign exchange forward and option contracts	'	251
Total	'	251
Level 3 [Member]	'	'
Liabilities fair value disclosure [Abstract]	'	'
Liability classified stock options	0	0
Restricted stock units	0	0
Stock appreciation rights	0	'
Total	0	0
Assets fair value disclosure [Abstract]	'	'
Foreign exchange forward and option contracts	'	0
Total	'	$0

Related_Party_Transactions_Det

Related Party Transactions (Details) (Marco International [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Jun. 30, 2013
Related Party Transaction [Line Items]	'	'	'	'	'
Purchases from related party	$5,481	$9,416	$11,249	$31,938	'
Due to related party	123	'	123	'	0
Ferrosilicon [Member]	'	'	'	'	'
Related Party Transaction [Line Items]	'	'	'	'	'
Sales of products to related party	124	0	368	411	'
Due from related party	62	'	62	'	0
Calcium Silicon Powder [Member]	'	'	'	'	'
Related Party Transaction [Line Items]	'	'	'	'	'
Sales of products to related party	1,730	332	3,663	1,246	'
Due from related party	1,018	'	1,018	'	0
Rare Earth [Member]	'	'	'	'	'
Related Party Transaction [Line Items]	'	'	'	'	'
Due to related party	0	0	0	0	'
Sales of products to related party	0	0	378	0	'
Due from related party	$0	'	$0	'	$0

Operating_Segments_External_cu

Operating Segments, External customers by products and services (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
			Segment
Operating Segments [Abstract]	'	'	'	'
Number of reportable segments	'	'	5	'
Revenue from External Customer by Product Line [Abstract]	'	'	'	'
Net sales	$196,057	$195,845	$547,457	$576,493
Silicon Metal [Member]	'	'	'	'
Revenue from External Customer by Product Line [Abstract]	'	'	'	'
Net sales	101,966	112,602	274,778	328,098
Silicon-based Alloys [Member]	'	'	'	'
Revenue from External Customer by Product Line [Abstract]	'	'	'	'
Net sales	74,818	60,164	205,594	184,760
Other [Member]	'	'	'	'
Revenue from External Customer by Product Line [Abstract]	'	'	'	'
Net sales	$19,273	$23,079	$67,085	$63,635

Operating_Segments_by_segment_

Operating Segments, by segment (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Jun. 30, 2013
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Sales	$196,057	$195,845	$547,457	$576,493	'
Operating Income (Loss)	7,739	-42,646	-4,060	-25,742	'
Income (Loss) Before Income Taxes	4,734	-45,936	8,291	-31,264	'
Total Assets	828,598	'	828,598	'	871,623
GMI [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Sales	181,749	185,712	505,225	535,249	'
Operating Income (Loss)	20,411	12,635	40,952	59,064	'
Income (Loss) Before Income Taxes	19,555	10,563	38,653	56,548	'
Total Assets	635,271	'	635,271	'	'
Globe Metales [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Sales	13,472	10,005	38,212	37,843	'
Operating Income (Loss)	2,260	-5,861	4,754	-3,164	'
Income (Loss) Before Income Taxes	869	-6,481	1,564	-4,658	'
Total Assets	71,207	'	71,207	'	'
Solsil [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Sales	0	0	0	0	'
Operating Income (Loss)	0	-20,552	-32	-20,987	'
Income (Loss) Before Income Taxes	0	-20,552	-32	-20,987	'
Total Assets	15,347	'	15,347	'	'
Corporate [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Sales	0	0	0	0	'
Operating Income (Loss)	-13,694	-20,224	-46,977	-49,960	'
Income (Loss) Before Income Taxes	-14,172	-20,687	-28,830	-51,277	'
Total Assets	370,948	'	370,948	'	'
Other [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Sales	3,067	2,836	9,708	8,299	'
Operating Income (Loss)	-1,126	-8,177	-2,805	-9,941	'
Income (Loss) Before Income Taxes	-1,406	-8,312	-3,112	-10,136	'
Total Assets	74,617	'	74,617	'	'
Eliminations [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Sales	-2,231	-2,708	-5,688	-4,898	'
Operating Income (Loss)	-112	-467	48	-754	'
Income (Loss) Before Income Taxes	-112	-467	48	-754	'
Total Assets	($338,792)	'	($338,792)	'	'

Operating_Segments_by_external

Operating Segments, by external customers and long lived assets (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Jun. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'
Net sales	$196,057	$195,845	$547,457	$576,493	'
Long-lived assets	501,964	'	501,964	'	466,101
United States [Member]	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'
Net sales	163,249	154,512	464,066	445,889	'
Long-lived assets	326,212	'	326,212	'	328,326
Argentina [Member]	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'
Net sales	11,377	7,560	33,309	33,208	'
Long-lived assets	25,749	'	25,749	'	24,344
Canada [Member]	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'
Net sales	18,364	31,104	40,653	89,264	'
Long-lived assets	87,549	'	87,549	'	95,591
China [Member]	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'
Net sales	26	42	243	246	'
Long-lived assets	15,531	'	15,531	'	16,955
Poland [Member]	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'
Net sales	3,041	2,627	9,186	7,886	'
Long-lived assets	832	'	832	'	885
South Africa [Member]	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'
Long-lived assets	$46,091	'	$46,091	'	$0

Operating_Segments_by_major_cu

Operating Segments, by major customers and by segments (Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

In Thousands, unless otherwise specified

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Jun. 30, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

7-May-14

Apr. 13, 2014

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Dow Corning [Member]

Dow Corning [Member]

Dow Corning [Member]

Dow Corning [Member]

Momentive Performance Materials [Member]

Momentive Performance Materials [Member]

Momentive Performance Materials [Member]

Momentive Performance Materials [Member]

Momentive Performance Materials [Member]

Momentive Performance Materials [Member]

All Other Customers [Member]

All Other Customers [Member]

All Other Customers [Member]

All Other Customers [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Revenue, Major Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of consolidated net sales (in hundredths)

100.00%

100.00%

100.00%

100.00%

'

19.00%

17.00%

18.00%

19.00%

11.00%

12.00%

9.00%

9.00%

'

'

70.00%

71.00%

73.00%

72.00%

Noncontrolling interest's ownership interest in consolidated affiliate (in hundredths)

49.00%

49.00%

49.00%

49.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accounts receivable

$95,330

'

$95,330

'

$83,816

'

'

'

'

'

'

'

'

'

$7,400

'

'

'

'

Prepetition claim subsequently collected

'

'

'

'

'

'

'

'

'

'

'

'

'

2,400

'

'

'

'

'

Accounts receivable accorded administrative priority

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$5,000

'

'

'

'

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	3 Months Ended			0 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	2-May-14
				Subsequent Event [Member]
				Dividends declared [Member]
Subsequent Event [Line Items]	'	'	'	'
Dividends declared (in dollars per share)	'	'	'	$0.30
Dividends per share to be paid quarterly (in dollars per share)	'	'	'	$0.08
Date of stockholders of record	'	'	'	10-Jun-14
Date dividends to be paid	12-Mar-14	23-Dec-13	24-Sep-13	24-Jun-14