Business Combination and Divestitures Divestiture (Details) - USD ($)										3 Months Ended	12 Months Ended
	Dec. 27, 2018	Dec. 21, 2018	Dec. 10, 2018	Dec. 04, 2018	Nov. 29, 2018	Nov. 20, 2018	Nov. 05, 2018	Aug. 31, 2018	Aug. 09, 2018	Jun. 30, 2019	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017	Nov. 28, 2018	Aug. 10, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating lease, term											25 years
Equity investments without readily determinable fair value:											$ 8,810,000	$ 35,840,000
Debt instrument, face value											904,073,000	1,621,766,000
Repayments of debt											17,358,000	6,888,000	$ 37,932,000
Long-term debt											40,528,000	430,634,000
Dividend from equity method investees											3,947,000	30,091,000	6,949,000
Net loss on sale of residential lease assets											(62,327,000)
Divestiture [Abstract]
Cash consideration from business divestiture									$ 25,000,000
Cash due at closing of agreement			$ 15,000,000
Final cash payment due			$ 10,000,000
Stock consideration received from business divestiture									42,600,000		42,600,000	$ 0	$ 0
Transaction costs related to business divestiture									(1,743,000)
Total consideration due from business divestiture									65,857,000
Assets sold due to business divestiture									(6,510,000)
Gain on business divestiture									$ 59,347,000
Mezzanine Loan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt instrument, face value															$ 110,500,000.0
Debt issuance costs, net															$ 1,400,000
Repayments of debt								$ 2,100,000
Long-term debt								$ 106,958,000
SunStrong Capital Holdings, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity investments without readily determinable fair value:							$ 9,649,000
SunStrong Residential Lease Portfolio, Portion Of Interest | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest sold							49.00%
Disposal consideration							$ 10,000,000
Deconsolidation of financing debt							561,600,000
Deferred gain on disposal							13,596,000
Dividend from equity method investees		$ 3,200,000
Proceeds from contributions from affiliates											4,200,000
Priority on future distribution														$ 1,400,000
Disposal, associated costs							2,879,000
Disposal group, warranty obligations, liability							5,308,000				5,300,000
Disposal Group, Including Discontinued Operation, Classified Balance Sheet Disclosures [Abstract]
Cash and equivalents							16,333,000
Restricted cash and equivalents, current portion							9,127,000
Accounts receivable, net							23,430,000
Prepaid expenses and other current assets							26,097,000
Restricted cash and equivalents, net of current portion							65,947,000
Property, plant and equipment, net							871,000
Solar power systems leased and to be leased, net							262,756,000
Long term financing receivables, net - held for sale							388,180,000
Other long-term assets							17,633,000
Total assets							810,374,000
Accounts payable							0
Accrued liabilities							1,726,000
Contract liabilities, current portion							1,660,000
Contract liabilities, net of current portion							25,477,000
Short-term debt							8,969,000
Long-term debt							445,661,000
Other long-term liabilities							11,164,000
Redeemable noncontrolling interests in subsidiaries							15,375,000
Noncontrolling interests in subsidiaries							61,865,000
Total liabilities and equity							571,897,000
Net assets related to sale							238,477,000
Special distributions and tax-equity contribution							36,190,000
Net consideration recognized from sale							183,425,000
Obligations to complete leases under construction							(11,616,000)
SunStrong Residential Lease Portfolio, Portion Of Interest | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Scenario, Plan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from contributions from affiliates											5,600,000
SunStrong Residential Lease Portfolio, Portion Of Interest | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Mezzanine 2
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Line of credit facility, maximum borrowing capacity							32,000,000.0
Proceeds from issuance of debt						$ 24,600,000
Distribution received from debt draw						$ 19,560,000
Deferred gain on disposal							5,000,000				1,000,000
Dividend from equity method investees		$ 4,600,000
SunStrong Residential Lease Portfolio, Portion Of Interest | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Mezzanine 2 | Scenario, Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from issuance of debt										$ 5,600,000
Additional consideration for related construction										$ 4,000,000
SunStrong Residential Lease Portfolio, Portion Of Interest | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Warehousing Loan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Line of credit facility, maximum borrowing capacity							170,000,000.0
Proceeds from issuance of debt							17,500,000
Deferred gain on disposal											$ 5,700,000
Additional consideration for related construction							11,800,000
Dividend from equity method investees	$ 7,700,000				$ 4,100,000
SunStrong Residential Lease Portfolio, Portion Of Interest | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Solar Asset Backed Notes, Series 2018-1
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt instrument, face value														$ 400,000,000
Dividend from equity method investees				$ 12,900,000
Interest rate														5.68%
Leased Solar Power Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating lease, term											20 years
Estimate of Fair Value Measurement | SunStrong Capital Holdings, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity investments without readily determinable fair value:							$ 9,600,000