Fair Value of Financial Instruments (Other Investments - Pensare) (Narrative) (Details) - Pensare [Member] - Chief Executive Officer [Member] - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Dec. 31, 2017	Sep. 30, 2017
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Cost method investment and warrants, amount paid (in dollars)		$ 2.0
Cost method investment, ownership percentage	4.00%
Plan [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Warrants, exercise price (in dollars per share)	$ 11.50
Common Stock [Member] | Plan [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Investment, restriction period (in years)	1 year
Warrant [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Warrants, number held	2,000,000