Leases Lease Disclosure (Details)	Sep. 30, 2018 Property number_of_restaurants
Property Subject to or Available for Operating Lease
Number of Restaurants | number_of_restaurants	6,669
Entity Operated Units
Property Subject to or Available for Operating Lease
Number of Restaurants | number_of_restaurants	350
Lessee Disclosure | Land and Building
Property Subject to or Available for Operating Lease
Property Subject to or Available for Operating Lease, Number of Units	145
Lessee Disclosure | Land and Building | Property Subject to Operating Lease
Property Subject to or Available for Operating Lease
Property Subject to or Available for Operating Lease, Number of Units	64
Lessee Disclosure | Land | Property Subject to Operating Lease
Property Subject to or Available for Operating Lease
Property Subject to or Available for Operating Lease, Number of Units	141
Lessor Disclosure | Property Subject to Operating Lease
Property Subject to or Available for Operating Lease
Property Subject to or Available for Operating Lease, Number of Units	1,281
Lessor Disclosure | Assets Leased to Others | Property Subject to Operating Lease
Property Subject to or Available for Operating Lease
Property Subject to or Available for Operating Lease, Number of Units	519