Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Sep. 30, 2015
Building [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	30 years
Furniture, equipment, and software development costs [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Furniture, equipment, and software development costs [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years