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Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Apr. 30, 2020	Oct. 31, 2019	Oct. 31, 2015
Debt Instrument [Line Items]
Finance lease, liability	$ 38		$ 141
Deferred finance costs	(3,737)		(3,180)
Unamortized debt discount	(5,152)		(4,251)
Total debt	165,355		106,317
Current portion of long-term debt	(21,366)		(21,916)
Long-term debt	143,989		84,401
Orion Energy Partners Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	80,000		14,500
Connecticut Green Bank Loans [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	4,800		1,800
Connecticut Green Bank Loan (BFC Loan) [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	5,065		5,755
Liberty Bank Term Loan Agreement (BFC Loan) [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	9,549		11,632
Fifth Third Bank Term Loan Agreement (BFC Loan) [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	9,549		11,632
Finance Obligations for Sale-Lease Back Transactions [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	49,274		45,219
State of Connecticut Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	9,454	$ 10,000	10,000	$ 10,000
New Britain Renewable Energy Term Loan [Member]
Debt Instrument [Line Items]
Long-term Line of Credit			497
Enhanced Capital Loan and Security Agreement [Member]
Debt Instrument [Line Items]
Long-term Line of Credit			1,500
Fifth Third Bank Construction Loan Agreement [Member]
Debt Instrument [Line Items]
Long-term Line of Credit			$ 11,072
Liberty Bank Promissory Note (PPP Note) [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	$ 6,515

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- Definition

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

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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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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Amount of long-term debt and lease obligation, classified as noncurrent.

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