Commitments and Contingencies - Summary of Accrued Warranty Activity (Details) - USD ($) $ in Thousands	3 Months Ended		8 Months Ended	9 Months Ended
	Aug. 31, 2015	Sep. 28, 2014	Aug. 31, 2015	Sep. 28, 2014
Product Warranties
Product Warranty Liability [Line Items]
Balance at the beginning of the period	$ 817	$ 817	$ 818	$ 817
Settlements and adjustments during the period	(817)		(818)
Balance at the end of the period		817		817
Solar Energy System Performance Warranty
Product Warranty Liability [Line Items]
Balance at the beginning of the period	420	39	525
Settlements and adjustments during the period	(145)	(10)	(250)	29
Balance at the end of the period	$ 275	$ 29	$ 275	$ 29