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Refranchising Summary of the pretax activity recorded as a result of the refranchising initiative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
May 31, 2018
USD ($)
franchise
May 31, 2017
USD ($)
franchise
Nov. 30, 2016
franchise
May 31, 2018
USD ($)
franchise
May 31, 2017
USD ($)
franchise
Aug. 31, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Number of refranchised Company Drive-Ins | franchise 2 5   8 5  
Proceeds from sales of Company Drive-Ins       $ 16,278 $ 62,393  
Proceeds receivable from sale of real estate $ 38,672     $ 38,672   $ 34,847
2017 Refranchising [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Number of refranchised Company Drive-Ins | franchise   0 53   110  
Proceeds from sales of Company Drive-Ins   $ 0     $ 20,036  
Proceeds from sale of real estate   4,749     4,749  
Initial and subsequent lease payments for real estate option   195     (3,201)  
Goodwill related to sales of Company Drive-Ins   0     (966)  
Deferred gain for real estate option   141     (899)  
Gain (loss) on assets held for sale   0     (65)  
Refranchising initiative gains, net   814     6,645  
Land and Building [Member] | 2017 Refranchising [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Assets sold, net of retained minority investment   (12,095)     (12,095)  
Equipment [Member] | 2017 Refranchising [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Assets sold, net of retained minority investment   847     (7,891)  
Proceeds from sale of real estate [Member] | 2017 Refranchising [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds receivable from sale of real estate   $ 6,977     $ 6,977