Stockholders' Equity (Schedule of Assumptions Used in Estimate of Fair Value of Stock Option Awards) (Details) (Stock Options [Member])	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Minimum [Member]
Expected term	5 years 9 months 18 days	5 years 9 months 18 days	5 years 10 months 24 days
Estimated volatility	38.50%	48.70%	48.90%
Estimated dividend yield	0.80%	0.80%	0.70%
Risk-free interest rate	1.70%	0.80%	0.80%
Maximum [Member]
Expected term	8 years 7 months 6 days	8 years 7 months 6 days	8 years 6 months
Estimated volatility	38.50%	54.90%	55.60%
Estimated dividend yield	0.80%	1.00%	1.10%
Risk-free interest rate	2.50%	1.30%	1.60%