Share-Based Compensation (Tables)

12 Months Ended

Sep. 30, 2013

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,
	2013		2012		2011
Expected stock price volatility	35	%	57	%	77	%
Expected dividend yield	—	%	—	%	—	%
Risk free interest rate	0.37	%	1.53	%	0.72	%
Average expected life (in years)	2.88		7.86		2.94

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, 2013:

	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, 2012	921,412		1,890,634		$	23.36	$	11.11	5.45	$	6.0
Additional shares authorized by shareholders	1,000,000
Termination of 2003 plan	(821,412	)
Granted	(100,000	)	100,000		$	17.53	$	4.21
Exercised			(177,246	)	$	8.40	$	5.26
Forfeited	—		(32,738	)	$	10.35	$	3.88
Expired	—		(667	)	$	23.49	$	11.58
Balances at September 30, 2013	1,000,000		1,779,983		$	24.76	$	11.44	4.87	$	4.8
Exercisable at September 30, 2013			680,820		$	27.47	$	11.04	1.91	$	3.1

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, 2013 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	301,875	$	7.02	1.18
$	10.00	-	$	15.00	—		n/a	n/a
$	15.00	-	$	20.00	322,179	$	18.01	2.40
$	20.00	-	$	25.00	126,204	$	23.52	3.10
$	25.00	-	$	30.00	800,000	$	25.91	8.22
$	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	229,725	$	54.23	2.45
					1,779,983	$	24.76	4.87

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, 2013:

	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, 2012	1,420,114		512,124		$	22.09	1.81	$	9.8
Granted	(268,885	)	268,885		$	17.92
Vested			(406,901	)	$	20.72
Forfeited	3,633		(10,470	)	$	22.62
Balances at September 30, 2013	1,154,862		363,638		$	20.53	1.74	$	7.4