Business and Operations (Details) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	May 01, 2017 USD ($)	Sep. 30, 2017 USD ($) state property	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) state property renewaloption	Sep. 30, 2016 USD ($)	Apr. 30, 2018 USD ($)
Business and Operations
Number of facilities whose real estate property is Included in entity portfolio | property		38		38
Number of real estate properties | property		36		36
Number of states across which the portfolio of properties is diversified | state		14		14
Real estate, occupancy percentage		100.00%		100.00%
Amount paid for acquisition of real estate assets | $				$ 83,252	$ 3,267,123
Rental income | $		$ 169,030	$ 160,664	$ 501,954	402,980
Penn National Gaming Inc
Business and Operations
Operating lease, initial term of contract (in years)				15 years
Operating leases, number of renewal options | renewaloption				4
Operating lease, renewal term (in years)				5 years
Number of real estate properties | property		20		20
Pinnacle Entertainment, Inc.
Business and Operations
Number of real estate properties | property		15		15
Pinnacle Entertainment, Inc. Master Lease
Business and Operations
Operating lease, initial term of contract (in years)				10 years
Operating leases, number of renewal options | renewaloption				5
Operating lease, renewal term (in years)				5 years
Number of real estate properties | property		14		14
Pinnacle Entertainment, Inc.
Business and Operations
Consideration paid for acquisition of real estate assets | $					$ 4,800,000
Tunica Properties
Business and Operations
Amount paid for acquisition of real estate assets | $	$ 82,900
Scenario, Forecast | Tunica Properties
Business and Operations
Rental income | $						$ 9,000