Name:	emkr_EmployeeStockPurchasePlanEsppTotalShares
Namespace Prefix:	emkr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Number of equity incentive compensation plans maintained by the Company.

No definition available.

Name:	emkr_NumberOfEquityIncentiveCompensationPlans
Namespace Prefix:	emkr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the EMCORE 2010 Equity Incentive Plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

No definition available.

Name:	emkr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedEmcore2010EquityIncentivePlan
Namespace Prefix:	emkr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the EMCORE 2012 Equity Incentive Plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

No definition available.

Name:	emkr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedEmcore2012EquityIncentivePlan
Namespace Prefix:	emkr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The difference between the maximum number of shares authorized for issuance under the EMCORE 2000 Stock Option Plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

No definition available.