Significant Accounting Policies (Fair Value Assumptions) (Details) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Accounting Policies [Abstract]
Weighted expected life	5 years	5 years	5 years
Risk-free interest rate	0.70%	1.00%
Risk-free interest rate, minimum			1.30%
Risk-free interest rate, maximum			2.60%
Expected volatility	62.88%	59.91%	59.01%
Weighted-average fair value of options granted during the period (in dollars per share)	$ 14.43	$ 3.55	$ 2.36
Expected annual forfeiture rate	5.31%	5.31%	5.31%