Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended				1 Months Ended	12 Months Ended			1 Months Ended			12 Months Ended				12 Months Ended
	Sep. 30, 2014 2014 Equity Incentive Plan	Feb. 28, 2014 2014 Equity Incentive Plan	Sep. 30, 2014 2014 Non-Employee Director Equity Incentive Plan	Feb. 28, 2014 2014 Non-Employee Director Equity Incentive Plan	Jan. 31, 2013 Restricted Stock	Sep. 30, 2014 Restricted Stock	Sep. 30, 2013 Restricted Stock	Sep. 30, 2012 Restricted Stock	Aug. 31, 2012 Restricted Stock 2006 Plan	Jun. 30, 2012 Restricted Stock 2006 Plan	Feb. 28, 2014 Restricted Stock 2014 Non-Employee Director Equity Incentive Plan	Sep. 30, 2014 Restricted Stock Units (RSUs)	Sep. 30, 2013 Restricted Stock Units (RSUs)	Sep. 30, 2012 Restricted Stock Units (RSUs)	Sep. 30, 2011 Restricted Stock Units (RSUs)	Sep. 30, 2014 Restricted Stock Units (RSUs) 2006 Plan	Sep. 30, 2014 Restricted Stock Units (RSUs) Performance Based Restricted Stock Unit	Sep. 30, 2014 Restricted Stock Units (RSUs) Time Based Restricted Stock Unit	Sep. 30, 2014 Restricted Stock Units (RSUs) Time Based Restricted Stock Unit Minimum	Sep. 30, 2014 Restricted Stock Units (RSUs) Time Based Restricted Stock Unit Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance		750,000		150,000
Shares issued under the plan	4,778				500		16,000	16,000	45,000	2,000	16,000					2,200
Number of shares available for grant	745,222		134,000
Shares issued, price per share					$ 42.54		$ 58.54	$ 37.50	$ 39.11	$ 37.50	$ 66.15
Vesting period									3 years	2 years	2 years	3 years					3 years	3 years
Restricted stock issuable to eligible Board of Directors members annually											2,000
Vesting percentage											50.00%						60.00%
Unvested restricted stock outstanding						54,240	68,100					106,845	81,555	99,725	69,378
Compensation expense						$ 1.3	$ 2.1	$ 0.7				$ 2.1	$ 2.4	$ 1.5
Target RSUs granted range																		40.00%	0.00%	150.00%
Amounts not yet recognized related to non-vested stock totaled												$ 2.4	$ 2.1
Weighted average remaining contractual life						10 months 13 days						1 year 1 month 24 days