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Refranchising Initiative Summary of the pretax activity recorded as a result of the refranchising initiative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Nov. 30, 2016
USD ($)
franchise
Nov. 30, 2015
USD ($)
Nov. 30, 2018
USD ($)
Nov. 30, 2017
USD ($)
Aug. 31, 2016
USD ($)
franchise
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Company Drive-Ins sold to franchisees | franchise 56       38
Proceeds from sales of Company Drive-Ins $ 10,826 $ 1,615      
Goodwill related to sales of Company Drive-Ins $ (76,266)       $ (76,734)
Refranchising Initiative 2017 [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Company Drive-Ins sold to franchisees | franchise 56        
Proceeds from sales of Company Drive-Ins $ 8,950        
Assets sold, net of retained minority investment (5,461)        
Goodwill related to sales of Company Drive-Ins (377)        
Initial lease payment for real estate option (3,810)        
Loss on assets held for sale (259)        
Refranchising initiative gains (losses), net $ (957)        
Refranchised Company Drive-Ins with direct financing lease | franchise 53        
Refranchising Initiative 2017 [Member] | Forecast [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Monthly lease payments receivable     $ 100 $ 300  
Refranchising Initiative 2016 [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Company Drive-Ins sold to franchisees | franchise         29
Proceeds from sales of Company Drive-Ins         $ 3,568
Assets sold, net of retained minority investment         (2,402)
Goodwill related to sales of Company Drive-Ins         (194)
Refranchising initiative gains (losses), net         $ 972