Share-Based Compensation (Tables)

12 Months Ended

Sep. 30, 2014

Disclosure of Compensation Related Costs, Share-based Payments [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:

	Year Ended September 30,
	2014		2013		2012
Expected stock price volatility	34	%	35	%	57	%
Expected dividend yield	—	%	—	%	—	%
Risk free interest rate	0.80	%	0.37	%	1.53	%
Average expected life (in years)	2.88		2.88		7.86

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

The following is a summary of stock option activity for the year ended September 30, 2014:

	Shares Available for Grant		Number of Options Outstanding		Weighted Average  Exercise Price		Weighted Average Grant Date Fair Value		Weighted Average Remaining Term (in years)	Aggregate Intrinsic Value ($ millions)
Balances at 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			(154,583	)	$	9.02	$	4.28
Forfeited	—		(101,197	)	$	26.10	$	13.22
Expired	—		(32,647	)	$	50.64	$	14.27
Balances at September 30, 2014	913,500		1,578,056		$	25.38	$	11.58	4.16	$	1.9
Exercisable at September 30, 2014			633,409		$	26.57	$	10.74	1.10	$	1.9

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

The options outstanding as of September 30, 2014 broken down by exercise price are as follows:

Exercise Price					Number of Options Outstanding	Weighted Average Exercise Price		Weighted Average Remaining Term (in Years)
$	—	-	$	5.00	—	n/a		n/a
$	5.00	-	$	10.00	180,315	$	6.92	0.18
$	10.00	-	$	15.00	—	n/a		n/a
$	15.00	-	$	20.00	362,756	$	18.51	1.98
$	20.00	-	$	25.00	118,889	$	23.53	2.22
$	25.00	-	$	30.00	720,000	$	25.91	7.22
$	30.00	-	$	35.00	—	n/a		n/a
$	35.00	-	$	40.00	—	n/a		n/a
$	40.00	-	$	45.00	—	n/a		n/a
$	45.00	-	$	50.00	—	n/a		n/a
$	50.00	-	$	55.00	196,096	$	54.23	1.80
					1,578,056	$	25.38	4.16

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

The following is a summary of restricted stock activity through September 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 at September 30, 2013	1,154,862		363,638		$	20.53	1.74	$	7.4
Granted	(90,749	)	90,749		$	19.61
Vested			(168,688	)	$	20.35
Forfeited	32,212		(55,848	)	$	21.61
Balances at September 30, 2014	1,096,325		229,851		$	20.03	1.79	$	4.0