Summary Of Significant Accounting Policies (Schedule Of Property, Plant, And Equipment, Estimated Useful Life) (Details)	12 Months Ended
	Sep. 30, 2016
Cinema equipment provided under operating leases [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful life, years	15 years
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful life, years	40 years
Minimum [Member] | Systems And Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful life, years	3 years
Minimum [Member] | Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful life, years	3 years
Minimum [Member] | Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful life, years	5 years
Maximum [Member] | Systems And Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful life, years	5 years
Maximum [Member] | Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful life, years	8 years
Maximum [Member] | Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful life, years	8 years