Balance Sheet Components - Schedule of Account Payables and Other Liabilities (Details) - USD ($) $ in Thousands	Aug. 31, 2015	Dec. 28, 2014
Accounts payable and other current liabilities
Residential lease financing fee payable to third-party investors		$ 1,865
Accrued project costs		8,775
Accrued accounts payable	$ 355
Residential lease system repairs accrual	1,094	660
Interest payable	123	366
Derivative financial instruments	770
Income taxes payable		23
Other short-term liabilities	69
Accounts payable and other current liabilities, Total	2,686	12,214
Other long-term liabilities
Derivative financial instruments		3,156
Asset retirement obligations	8,450
Deferred tax liabilities	695
Warranty reserves		818
Other long-term liabilities,Total	9,145	3,974
Solar Energy System Performance Warranty
Accounts payable and other current liabilities
System output performance warranty	275	525
Accounts payable and other current liabilities, Total	$ 300	$ 500