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Commitments and Contingencies - Additional Information (Details) - USD ($)
3 Months Ended 8 Months Ended 9 Months Ended
Aug. 31, 2015
Sep. 28, 2014
Aug. 31, 2015
Sep. 28, 2014
Dec. 28, 2014
Commitments And Contingencies Disclosure [Line Items]          
Accounts payable and other current liabilities $ 2,686,000   $ 2,686,000   $ 12,214,000
Other current assets 2,080,000   2,080,000    
Environmental contingencies 0 $ 0 0 $ 0  
Solar Energy System Performance Warranty          
Commitments And Contingencies Disclosure [Line Items]          
Accounts payable and other current liabilities 300,000   300,000   500,000
Other current assets 300,000   300,000   $ 0
Selling, General and Administrative Expenses          
Commitments And Contingencies Disclosure [Line Items]          
Total leases and easement expense $ 100,000 $ 500,000 $ 1,100,000 $ 1,000,000