Lease Agreements and Power Purchase Agreements - Additional Information (Details)	3 Months Ended
Feb. 28, 2018 Lease
Operating Leased Assets [Line Items]
Estimated residual value over the lease term (in years)	20 years
Residential Portfolio
Operating Leased Assets [Line Items]
Number of solar homeowners	5,800

Term of the lessor's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration