PROPERTY AND EQUIPMENT, NET (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross			$ 2,478,084	$ 2,444,566
Accumulated depreciation			(1,151,540)	(1,092,511)
Total property and equipment, net			1,326,544	1,352,055
Depreciation expense			73,300	77,000	$ 79,600
Capitalized interest					735
Impairment		$ 2,500			5,000
Proceeds from asset sales			335	1,615	134
Conceptual Design Work
Property, Plant and Equipment, Net, by Type [Abstract]
Impairment					$ 5,000
Land
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross			44,848	45,534
Land improvements
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross			100,466	97,838
Buildings and improvements
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross			1,737,053	1,733,924
Furniture and equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross			560,947	555,884
Construction in process
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross			$ 34,770	$ 11,386
Asset under Construction
Property, Plant and Equipment, Net, by Type [Abstract]
Proceeds from asset sales	$ 1,300