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Debt and Leases Debt (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013	Nov. 09, 2015	Jun. 25, 2013	Mar. 05, 2013
Debt Instrument [Line Items]
Payments of Debt Issuance Costs	$ 0	$ 0	$ 2,472
Line of Credit Facility, Amount Outstanding	2,945	945
Long-term Debt, Current Maturities	7,358	1,439
Long-term Debt, Excluding Current Maturities	8,945	9,312
Interest Paid	$ 677	$ 1,892	$ 280
Lease Payment Terms	36 months
Convertible Debt [Member]
Debt Instrument [Line Items]
Stock Issued During Period, Shares, Conversion of Convertible Securities		2,040
Common stock issued to settle make-whole obligation, value		$ 12,900
Convertible Debt		$ 38,000			$ 38,000
Debt Instrument, Interest Rate, Stated Percentage					8.00%
Common stock issued to settle make-whole obligation, shares		500
JPMorgan Chase Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 4,000
NRG Energy [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	40,000
NRG Energy, Inc. [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	3,763	$ 0
Connecticut Development Authority Note [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	2,817	3,033
Debt Instrument, Face Amount	$ 4,000
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Collateralized Agreements	$ 4,000
Connecticut Clean Energy Fund [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						$ 5,900
Line of Credit Facility, Amount Outstanding	$ 6,052	$ 6,052
Debt Instrument, Interest Rate, Stated Percentage						5.00%
CT Dept of Economic & Community Development [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 10,000
Debt Instrument, Interest Rate, Stated Percentage				2.00%

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- Definition

Common stock issued to settle make-whole obligation, value

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Lease Payment Terms

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Stock Issued During Period, Shares, Conversion of Convertible Securities, Debt Obligation

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- Definition

The total of collateralized agreements including securities purchased under agreements to resell (repos), borrowed securities, and secured demand notes.

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of cash paid for interest during the period.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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