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Leases (Narrative) (Details)
12 Months Ended
Aug. 31, 2018
Leases [Line Items]  
Lease expiration date May 31, 2037
Lease renewal options, initial term period 5 years
Company Drive Ins [Member]  
Leases [Line Items]  
Lease expiration date Jan. 22, 2037
Direct Financing Leases [Member]  
Leases [Line Items]  
Lease expiration date Sep. 30, 2031