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Revenue Recognition (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 26, 2018
Mar. 31, 2019
Mar. 31, 2019
Oct. 01, 2018
Sep. 30, 2018
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]          
Deferred Revenue, Current   $ 1,311,400 $ 1,311,400 $ 1,220,900 $ 1,642,900
Deferred Revenue, Noncurrent   6,761,900 6,761,900 6,839,700 $ 6,775,700
Revenue Recognition Period Stored Value Cards and Loyalty Program Breakage [Member]          
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]          
Deferred Revenue, Current   1,100,000 1,100,000 906,600  
Deferred Revenue, Noncurrent   73,600 73,600 $ 64,000  
Company-operated stores [Member] | Revenue Recognition Period Stored Value Cards and Loyalty Program Breakage [Member]          
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]          
Contract with Customer, Liability, Revenue Recognized   37,500 72,300    
Licensed stores [Member] | Revenue Recognition Period Stored Value Cards and Loyalty Program Breakage [Member]          
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]          
Contract with Customer, Liability, Revenue Recognized   4,700 9,300    
Nestle Global Coffee Alliance [Member]          
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]          
Deferred Revenue $ 7,000,000        
Prepaid Royalty Economic Life 40 years        
Deferred Revenue, Current   174,000 174,000    
Deferred Revenue, Noncurrent   $ 6,700,000 $ 6,700,000