Stock-Based Compensation (Tables)

9 Months Ended

Jun. 30, 2014

Stock-Based Compensation [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Fair value is estimated at the grant date based on a Black-Scholes-Merton option-pricing model using the following weighted-average assumptions:

	Nine Months Ended June 30, 2014
Expected stock price volatility	34%
Expected dividend yield	—%
Risk free interest rate	0.80%
Average expected life (in years)	2.88

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

The following is a summary of stock option activity for the nine months ended June 30, 2014:

	Shares Available for Grant		Number of Options Outstanding		Weighted Average Price		Weighted Average Grant Date Fair Value		Weighted Average Remaining Term (in years)	Aggregate Intrinsic Value ($ millions)
Balances as of September 30, 2013	1,000,000		1,779,983		$	24.76	$	11.44	4.87	$	4.8
Granted	(86,500	)	86,500		$	19.24	$	4.48
Exercised			(152,917	)	$	9.05	$	4.29
Forfeited	—		(89,815	)	$	25.47	$	13.20
Expired	—		(32,647	)	$	50.64	$	14.27
Balances as of June 30, 2014	913,500		1,591,104		$	25.40	$	11.59	4.39	$	2.9
Exercisable as of June 30, 2014			664,957		$	26.62	$	10.78	1.36	$	2.7

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

The following is a summary of restricted stock activity for the nine months ended June 30, 2014:

	Shares Available for Grant		Number of Shares Outstanding		Weighted Average Grant Date Fair Value		Weighted Average Remaining Term (in years)	Aggregate Intrinsic Value ($ millions)
Balances as of September 30, 2013	1,154,862		363,638		$	20.53	1.74	$	7.4
Granted	(84,341	)	84,341		$	19.60
Vested			(151,970	)	$	20.32
Forfeited	31,053		(54,689	)	$	21.67
Balances as of June 30, 2014	1,101,574		241,320		$	20.07	1.97	$	4.8