Share-Based Compensation to Employees (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended				12 Months Ended					12 Months Ended	0 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013 Long Term Incentive Plan [Member]	Sep. 30, 2013 Stock Options [Member]	Sep. 30, 2012 Stock Options [Member]	Sep. 30, 2011 Stock Options [Member]	Sep. 30, 2010 Stock Options [Member]	Sep. 30, 2013 Stock Options [Member] 2008 Plan [Member]	Sep. 30, 2013 Stock Options [Member] Long Term Incentive Plan [Member]	Jun. 12, 2013 Restricted Stock Units [Member] 2008 Plan [Member]	Sep. 30, 2013 Restricted Stock Units [Member] 2008 Plan [Member]	Sep. 30, 2013 Restricted Stock Units [Member] Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					4 years					3 years		3 years	3 years
Maximum expiration period					10 years					10 years
Stock options outstanding					3,302	2,448	1,836	1,762	2,259
Maximum number of shares authorized				6,000
Weighted-average fair value per option					$ 7.26	$ 6.39	$ 5.91
RSUs with accelarated vesting due to IPO											623
Period over which compensation becomes payable											1 year
Allocated share-based compensation expense	$ 12,628	$ 2,676	$ 1,468								$ 9,351