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Business Combinations - Purchase Allocation for Acquired Assets and Liabilities (Details) - USD ($)
$ in Thousands
Aug. 31, 2016
May 31, 2016
Nov. 30, 2015
Aug. 31, 2015
Jun. 24, 2015
May 31, 2015
Dec. 28, 2014
Business Acquisition [Line Items]              
Asset retirement obligation $ (11,883) $ (11,542) $ (9,992) $ (8,450)   $ (3,868) $ 0
I P O First Solar Project Entities              
Business Acquisition [Line Items]              
Property and equipment         $ 56,497    
Asset retirement obligation         (2,130)    
Total purchase price         408,820    
I P O First Solar Project Entities | Solar Gen Two Project Entity              
Business Acquisition [Line Items]              
Equity method investment         216,483    
I P O First Solar Project Entities | North Star              
Business Acquisition [Line Items]              
Equity method investment         103,849    
I P O First Solar Project Entities | Lost Hills Blackwell              
Business Acquisition [Line Items]              
Equity method investment         $ 34,121