Stock-Based Compensation (Schedule of Assumptions Used in Estimate of Fair Value of Stock Option Awards) (Details)	3 Months Ended	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2014 Minimum [Member]	Mar. 31, 2013 Minimum [Member]	Mar. 31, 2014 Maximum [Member]	Mar. 31, 2013 Maximum [Member]
Expected term	5 years 9 months 18 days	5 years 9 months 18 days	5 years 9 months 18 days	8 years 7 months 6 days	8 years 7 months 6 days
Estimated volatility	54.90%	38.50%	48.70%	38.50%	54.90%
Estimated dividend yield	0.80%	0.80%	0.80%	0.80%	1.00%
Risk-free interest rate	1.00%	1.70%	0.80%	2.50%	1.30%