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Segment Information (Details) $ in Thousands	3 Months Ended		12 Months Ended
Segment Information (Details) $ in Thousands	Apr. 03, 2016 USD ($)	Mar. 29, 2015 USD ($)	Jan. 03, 2016 segments	Dec. 28, 2014
Segment Reporting Information [Line Items]
Reconciliation of Operating Profit (Loss) from Segments to Consolidated	6306	58831
Number of Reportable Segments \| segments			3
Cost of revenue	$ 333,338	$ 350,053
Gross margin	51,537	90,818
Depreciation and amortization	(33,826)	(28,604)
Revenue	384,875	440,871
Stock-based compensation expense	16,520	13,546
Stock-based compensation	16,520	13,546
Net Income (Loss) Attributable to Noncontrolling Interest	0	(9,900)
Non-cash interest expense	(346)	(4,680)
Cash Interest Expense, Net of Interest Income	(12,184)	(11,092)
Provision for income taxes	(3,181)	(2,351)
Net income (loss) attributable to stockholders	$ (85,409)	$ (9,581)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Reconciliation of Operating Profit (Loss) from Segments to Consolidated	-11954	1930
Solar power systems [Member]
Segment Reporting Information [Line Items]
Cost of revenue	$ 75,063	$ 92,367
Gross margin	20,569	23,299
Revenue	$ 95,632	$ 115,666
Residential leases [Member]
Segment Reporting Information [Line Items]
Reconciliation of Operating Profit (Loss) from Segments to Consolidated	29578	32624
Cost of revenue	$ 43,097	$ 30,405
Gross margin	13,078	9,253
Revenue	$ 56,175	$ 39,658
Commercial [Member]
Segment Reporting Information [Line Items]
Reconciliation of Operating Profit (Loss) from Segments to Consolidated	-2440	-6900
Cost of revenue	$ 45,226	$ 46,880
Gross margin	7,015	2,183
Revenue	$ 52,241	$ 49,063
Power Plant [Member]
Segment Reporting Information [Line Items]
Reconciliation of Operating Profit (Loss) from Segments to Consolidated	-8878	31177
Cost of revenue	$ 169,952	$ 180,401
Gross margin	10,875	56,083
Revenue	$ 180,827	$ 236,484
Power Plant [Member] \| Prieska [Member]
Segment Reporting Information [Line Items]
Segment Reporting, Disclosure of Major Customers	.11
Power Plant [Member] \| 8point3 [Member]
Segment Reporting Information [Line Items]
Segment Reporting, Disclosure of Major Customers	.28
Power Plant [Member] \| Mid American Energy Holdings Company [Member]
Segment Reporting Information [Line Items]
Segment Reporting, Disclosure of Major Customers	*	0.33
Power Plant [Member] \| NRG Solar Inc. [Member]
Segment Reporting Information [Line Items]
Revenue As Percentage Of Total Revenues			0.00%	0.00%
Revenue [Member] \| Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
8point3 Energy Partners	$ (10,719)	$ 0
Profit, Operating Lease	(3,120)	0
Stock-based compensation	(16,520)	(13,546)
Revenue, Other	(8,608)	(14,170)
Gross margin [Member] \| Residential leases [Member]
Segment Reporting Information [Line Items]
Gross margin	$ 33,647	$ 32,552
Gross margin, As a percentage of total revenues	22.16433%	20.95748%
Gross margin, As reviewed by CODM	$ 37,583	$ 35,278
Gross margin, As a percentage of total revenues (As reviewed by CODM)	23.35828%	22.71252%
Gross margin [Member] \| Commercial [Member]
Segment Reporting Information [Line Items]
Gross margin	$ 7,015	$ 2,183
Gross margin, As a percentage of total revenues	13.42815%	4.44938%
Gross margin, As reviewed by CODM	$ 8,332	$ 3,025
Gross margin, As a percentage of total revenues (As reviewed by CODM)	15.94916%	6.16554%
Gross margin [Member] \| Power Plant [Member]
Segment Reporting Information [Line Items]
Gross margin	$ 10,875	$ 56,083
Gross margin, As a percentage of total revenues	6.01404%	23.71535%
Gross margin, As reviewed by CODM	$ 13,107	$ 49,858
Gross margin, As a percentage of total revenues (As reviewed by CODM)	5.94414%	22.04019%
8point3 Energy Partners	$ 4,157
Gross margin [Member] \| Segment Reconciling Items [Member] \| Residential leases [Member]
Segment Reporting Information [Line Items]
8point3 Energy Partners	485
Gross margin, Utility and power plant projects	0	$ 0
Profit, Operating Lease	(3,112)
Stock-based compensation expense	827	(922)
Gross margin, Other	(482)	1,804
Gross margin [Member] \| Segment Reconciling Items [Member] \| Commercial [Member]
Segment Reporting Information [Line Items]
8point3 Energy Partners	0
Gross margin, Utility and power plant projects	0	0
Profit, Operating Lease	0
Stock-based compensation expense	652	(388)
Gross margin, Other	(665)	454
Gross margin [Member] \| Segment Reconciling Items [Member] \| Power Plant [Member]
Segment Reporting Information [Line Items]
Gross margin, Utility and power plant projects	(3,557)	11,251
Profit, Operating Lease	0
Stock-based compensation expense	2,646	(1,256)
Gross margin, Other	(186)	3,770
Sales [Member] \| Residential leases [Member]
Segment Reporting Information [Line Items]
Revenue	151,807	155,324
Revenue, As reviewed by CODM	160,898	155,324
Sales [Member] \| Commercial [Member]
Segment Reporting Information [Line Items]
Revenue	52,241	49,063
Revenue, As reviewed by CODM	52,241	49,063
Sales [Member] \| Power Plant [Member]
Segment Reporting Information [Line Items]
Revenue	180,827	236,484
Revenue, As reviewed by CODM	220,503	226,214
Sales [Member] \| Segment Reconciling Items [Member] \| Residential leases [Member]
Segment Reporting Information [Line Items]
8point3 Energy Partners	1,312
Revenue, Utility and power plant project	0	0
revenue, net, operating lease	(10,403)
Stock-based compensation expense	0	0
Revenue, Other	0	0
Sales [Member] \| Segment Reconciling Items [Member] \| Commercial [Member]
Segment Reporting Information [Line Items]
8point3 Energy Partners	0
Revenue, Utility and power plant project	0	0
revenue, net, operating lease	0
Stock-based compensation expense	0	0
Revenue, Other	0	0
Sales [Member] \| Segment Reconciling Items [Member] \| Power Plant [Member]
Segment Reporting Information [Line Items]
8point3 Energy Partners	13,862
Revenue, Utility and power plant project	(53,538)	10,270
revenue, net, operating lease	0
Stock-based compensation expense	0	0
Revenue, Other	$ 0	$ 0
JAPAN
Segment Reporting Information [Line Items]
Revenue As Percentage Of Total Revenues	3.00%	16.00%
REST OF WORLD [Member]
Segment Reporting Information [Line Items]
Revenue As Percentage Of Total Revenues	20.00%	17.00%
All Countries [Domain]
Segment Reporting Information [Line Items]
Revenue As Percentage Of Total Revenues	100.00%	100.00%
UNITED STATES
Segment Reporting Information [Line Items]
Revenue As Percentage Of Total Revenues	77.00%	67.00%