Commitments and Contingencies	9 Months Ended
Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Lease Obligations: We lease certain land, facilities, and equipment under non-cancelable operating leases. Operating lease amounts exclude renewal option periods, property taxes, insurance, and maintenance expenses on leased properties. Our facility leases typically provide for rental adjustments for increases in base rent (up to specific limits), property taxes, insurance, and general property maintenance that would be recorded as rent expense. Rent expense was approximately $0.5 million and $0.6 million for the three months ended June 30, 2014 and 2013, respectively, and approximately $1.3 million and $1.8 million for the nine months ended June 30, 2014 and 2013, respectively. There are no off-balance sheet arrangements other than our operating leases. Asset Retirement Obligations: We have known conditional asset retirement conditions, such as certain asset decommissioning and restoration of rented facilities to be performed in the future. Our asset retirement obligations include assumptions related to renewal option periods for those facilities where we expect to extend lease terms. In future periods, the asset retirement obligation is accreted for the change in its present value and capitalized costs are depreciated over the useful life of the related assets. If the fair value of the estimated asset retirement obligation changes, an adjustment will be recorded to both the asset retirement obligation and the asset retirement capitalized cost. Revisions in estimated liabilities can result from revisions of estimated inflation rates, escalating retirement costs, and changes in the estimated timing of settling asset retirement obligations. The fair value of our asset retirement obligations were estimated by discounting projected cash flows over the estimated life of the related assets using credit adjusted risk-free rates which ranged from 3.25% to 5.78%. There were no asset retirement obligations settled during the three and nine months ended June 30, 2014 and 2013. Accretion expense of $0.1 million and $0.2 million was recorded during the three and nine months ended June 30, 2014, and 2013, respectively. Indemnifications: We have agreed to indemnify certain customers against claims of infringement of the intellectual property rights of others in our sales contracts with these customers. Historically, we have not paid any claims under these indemnification obligations. On September 19, 2013, we received written notice from a customer of our broadband products requesting indemnification relating to a lawsuit brought against them alleging patent infringement of a system incorporating our product. As of June 30, 2014, there has been no resolution to this claim. In March 2012, we entered into a Master Purchase Agreement with SEI, pursuant to which we agreed to sell certain assets and transfer certain obligations associated with our Fiber Optics segment. Under the terms of the Master Purchase Agreement, we have agreed to indemnify SEI for up to $3.4 million of potential claims and expenses for the two-year period following the sale and we recorded this amount as a deferred gain on our balance sheet as of June 30, 2014 and September 30, 2013 as a result of these contingencies. In April 2013, May 2013 and May 2014, we received letters from SEI asserting indemnification claims under the Master Purchase Agreement of at least $1.5 million. As of June 30, 2014, there has been no resolution to these claims. See Note 1 - Description of Business in the notes to the condensed consolidated financial statements for additional disclosures related to this asset sale. Legal Proceedings: We are subject to various legal proceedings, claims, and litigation, either asserted or unasserted that arise in the ordinary course of business. While the outcome of these matters is currently not determinable, we do not expect the resolution of these matters will have a material adverse effect on our business, financial position, results of operations, or cash flows. However, the results of these matters cannot be predicted with certainty. Professional legal fees are expensed when incurred. We accrue for contingent losses when such losses are probable and reasonably estimable. In the event that estimates or assumptions prove to differ from actual results, adjustments are made in subsequent periods to reflect more current information. Should we fail to prevail in any legal matter or should several legal matters be resolved against the Company in the same reporting period, then the financial results of that particular reporting period could be materially affected. a) Intellectual Property Lawsuits We protect our proprietary technology by applying for patents where appropriate and, in other cases, by preserving the technology, related know-how and information as trade secrets. The success and competitive position of our product lines are impacted by our ability to obtain intellectual property protection for our research and development efforts. We have, from time to time, exchanged correspondence with third parties regarding the assertion of patent or other intellectual property rights in connection with certain of our products and processes. b) Nichia Corporation On October 8, 2013, we were served with a complaint filed by Nichia Corporation in the United States District Court for the Eastern District of Texas, alleging infringement of Nichia's U.S. Patent No. 7.295.587 entitled "Semiconductor Laser Having Optical Guide Layer Doped for Decreasing Resistance" by one of our broadband products, unspecified monetary damages and injunctive relief (Nichia Corporation v. EMCORE Corporation, Case No.: 2-13-CV480). During the three months ended June 30, 2014, we entered into a settlement agreement which resolved Nichia's lawsuit. Under the settlement, we acknowledged the validity of Nichia's '587 patent, and paid an immaterial sum of money for damages to Nichia. Also under the settlement agreement, Nichia granted Emcore a non-exclusive, royalty-bearing license to the '587 patent.

Commitments and Contingencies

Operating Lease Obligations: We lease certain land, facilities, and equipment under non-cancelable operating leases. Operating lease amounts exclude renewal option periods, property taxes, insurance, and maintenance expenses on leased properties. Our facility leases typically provide for rental adjustments for increases in base rent (up to specific limits), property taxes, insurance, and general property maintenance that would be recorded as rent expense. Rent expense was approximately $0.5 million and $0.6 million for the three months ended June 30, 2014 and 2013, respectively, and approximately $1.3 million and $1.8 million for the nine months ended June 30, 2014 and 2013, respectively. There are no off-balance sheet arrangements other than our operating leases.

Asset Retirement Obligations: We have known conditional asset retirement conditions, such as certain asset decommissioning and restoration of rented facilities to be performed in the future. Our asset retirement obligations include assumptions related to renewal option periods for those facilities where we expect to extend lease terms. In future periods, the asset retirement obligation is accreted for the change in its present value and capitalized costs are depreciated over the useful life of the related assets. If the fair value of the estimated asset retirement obligation changes, an adjustment will be recorded to both the asset retirement obligation and the asset retirement capitalized cost. Revisions in estimated liabilities can result from revisions of estimated inflation rates, escalating retirement costs, and changes in the estimated timing of settling asset retirement obligations. The fair value of our asset retirement obligations were estimated by discounting projected cash flows over the estimated life of the related assets using credit adjusted risk-free rates which ranged from 3.25% to 5.78%. There were no asset retirement obligations settled during the three and nine months ended June 30, 2014 and 2013. Accretion expense of $0.1 million and $0.2 million was recorded during the three and nine months ended June 30, 2014, and 2013, respectively.

Indemnifications: We have agreed to indemnify certain customers against claims of infringement of the intellectual property rights of others in our sales contracts with these customers. Historically, we have not paid any claims under these indemnification obligations. On September 19, 2013, we received written notice from a customer of our broadband products requesting indemnification relating to a lawsuit brought against them alleging patent infringement of a system incorporating our product. As of June 30, 2014, there has been no resolution to this claim. In March 2012, we entered into a Master Purchase Agreement with SEI, pursuant to which we agreed to sell certain assets and transfer certain obligations associated with our Fiber Optics segment. Under the terms of the Master Purchase Agreement, we have agreed to indemnify SEI for up to $3.4 million of potential claims and expenses for the two-year period following the sale and we recorded this amount as a deferred gain on our balance sheet as of June 30, 2014 and September 30, 2013 as a result of these contingencies. In April 2013, May 2013 and May 2014, we received letters from SEI asserting indemnification claims under the Master Purchase Agreement of at least $1.5 million. As of June 30, 2014, there has been no resolution to these claims. See Note 1 - Description of Business in the notes to the condensed consolidated financial statements for additional disclosures related to this asset sale.

Legal Proceedings: We are subject to various legal proceedings, claims, and litigation, either asserted or unasserted that arise in the ordinary course of business. While the outcome of these matters is currently not determinable, we do not expect the resolution of these matters will have a material adverse effect on our business, financial position, results of operations, or cash flows. However, the results of these matters cannot be predicted with certainty. Professional legal fees are expensed when incurred. We accrue for contingent losses when such losses are probable and reasonably estimable. In the event that estimates or assumptions prove to differ from actual results, adjustments are made in subsequent periods to reflect more current information. Should we fail to prevail in any legal matter or should several legal matters be resolved against the Company in the same reporting period, then the financial results of that particular reporting period could be materially affected.

a) Intellectual Property Lawsuits

We protect our proprietary technology by applying for patents where appropriate and, in other cases, by preserving the technology, related know-how and information as trade secrets. The success and competitive position of our product lines are impacted by our ability to obtain intellectual property protection for our research and development efforts. We have, from time to time, exchanged correspondence with third parties regarding the assertion of patent or other intellectual property rights in connection with certain of our products and processes.

b) Nichia Corporation

On October 8, 2013, we were served with a complaint filed by Nichia Corporation in the United States District Court for the Eastern District of Texas, alleging infringement of Nichia's U.S. Patent No. 7.295.587 entitled "Semiconductor Laser Having Optical Guide Layer Doped for Decreasing Resistance" by one of our broadband products, unspecified monetary damages and injunctive relief (Nichia Corporation v. EMCORE Corporation, Case No.: 2-13-CV480). During the three months ended June 30, 2014, we entered into a settlement agreement which resolved Nichia's lawsuit. Under the settlement, we acknowledged the validity of Nichia's '587 patent, and paid an immaterial sum of money for damages to Nichia. Also under the settlement agreement, Nichia granted Emcore a non-exclusive, royalty-bearing license to the '587 patent.