Stockholders' Equity (Schedule of Assumptions Used in Estimate of Fair Value of Stock Option Awards) (Details)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Minimum [Member]
Expected term	6 years 2 months 12 days	5 years 9 months 18 days	5 years 9 months 18 days
Estimated volatility	36.50%	38.50%	48.70%
Estimated dividend yield	0.70%	0.80%	0.80%
Risk-free interest rate	2.00%	1.70%	0.80%
Maximum [Member]
Expected term	8 years 9 months 18 days	8 years 7 months 6 days	8 years 7 months 6 days
Estimated volatility	36.50%	38.50%	54.90%
Estimated dividend yield	0.70%	0.80%	1.00%
Risk-free interest rate	2.30%	2.50%	1.30%