Stock-Based Compensation - Stock Based Compensation Table (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	921,412
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,890,634
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	(100,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease)	100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(127,268)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	6,666
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period	(18,498)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Net	243
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period	(910)
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,000,000		921,412
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,843,958		1,890,634
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	731,352
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 24.43		$ 23.36
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 17.53
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 5.47
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 8.38
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price	$ 21.23
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 26.67
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value	$ 11.38		$ 11.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 4.21
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excrecises in Period, Weighted Average Grant Date Fair Value	$ 2.81
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeited in Period, Weighted Average Grant Date Fair Value	$ 3.60
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expired in Period, Weighted Average Grant Date Fair Value	$ 10.27
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excercisable, Weighted Average Grant Date Fair Value	$ 11.07
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	4 years 358 days		5 years 164 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	2 years 26 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 3.4		$ 6.0
Expiration of 2003 Plan	(828,321)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	2.2
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options	10.5
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	5 years 329 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 1.8	$ 3.0

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