Stock-Based Compensation (Tables)

12 Months Ended

Sep. 30, 2012

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,
	2012		2011		2010
Expected stock price volatility	57	%	77	%	85	%
Expected dividend yield	—	%	—	%	—	%
Risk free interest rate	1.53	%	0.72	%	1.45	%
Average expected life (in years)	7.86		2.94		2.80

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, 2012:

	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, 2011	750,481		1,344,646		$	21.05	$	8.93	3.06	$	9.8
Additional shares authorized by shareholders	1,000,000
Granted	(925,000	)	925,000		$	25.71	$	13.57
Exercised			(212,160	)	$	8.68	$	6.11
Forfeited	46,500		(46,500	)	$	25.74	$	13.53
Expired	49,431		(120,352	)	$	40.56	$	13.54
Balances at September 30, 2012	921,412		1,890,634		$	23.36	$	11.11	5.45	$	6.0
Exercisable at September 30, 2012			695,702		$	26.84	$	11.13	2.63	$	2.7

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, 2012 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	68,374	$	2.50	0.43
$	5.00	-	$	10.00	379,830	$	7.03	2.13
$	10.00	-	$	15.00	8,560	$	14.60	0.63
$	15.00	-	$	20.00	276,269	$	18.12	2.75
$	20.00	-	$	25.00	127,876	$	23.51	4.07
$	25.00	-	$	30.00	800,000	$	25.91	9.22
$	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	3.49
					1,890,634	$	23.36	5.45

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, 2012:

	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, 2011	290,963		299,118		$	17.71	1.92	$	6.2
Termination of 2007 Plan	(22,075	)
Additional shares authorized by shareholders	1,500,000
Granted	(348,961	)	348,961		$	23.82
Vested			(135,627	)	$	16.89
Forfeited	187		(328	)	$	23.02
Balances at September 30, 2012	1,420,114		512,124		$	22.09	1.81	$	9.8