Share-Based Compensation (Tables)

9 Months Ended

Jun. 30, 2015

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, 2015
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, 2015:

	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, 2014	913,500		1,578,056		$	25.38	$	11.58	4.16	$	1.9
Granted	(91,000	)	91,000		$	20.54	$	4.31
Exercised			(315,131	)	$	11.85	$	6.43
Forfeited	3,665		(7,332	)	$	19.10	$	4.99
Expired	—		(45,359	)	$	27.92	$	12.08
Balances as of June 30, 2015	826,165		1,301,234		$	28.26	$	12.34	4.48	$	10.5
Exercisable as of June 30, 2015			356,267		$	37.88	$	13.52	1.54	$	2.3

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, 2015:

	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, 2014	1,096,325		229,851		$	20.03	1.79	$	4.0
Granted	(116,024	)	116,024		$	20.48
Vested			(108,083	)	$	21.42
Forfeited	470		(470	)	$	18.08
Balances as of June 30, 2015	980,771		237,322		$	19.62	2.30	$	7.9