Stock-Based Compensation Options by Exercise Price (Details) (USD $)	12 Months Ended
	Sep. 30, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	1,890,634
Weighted Average Exercise Price	$ 23.36
Weighted Average Remaining Term (in years)	5 years 5 months 12 days
$0 - $5,00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	68,374
Weighted Average Exercise Price	$ 2.50
Weighted Average Remaining Term (in years)	5 months 4 days
Exercise Price Range, Lower Range Limit	$ 0.00
Exercise Price Range, Upper Range Limit	$ 5.00
$5.00 - $10.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	379,830
Weighted Average Exercise Price	$ 7.03
Weighted Average Remaining Term (in years)	2 years 1 month 17 days
Exercise Price Range, Lower Range Limit	$ 5.00
Exercise Price Range, Upper Range Limit	$ 10.00
$10.00 - $15.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	8,560
Weighted Average Exercise Price	$ 14.60
Weighted Average Remaining Term (in years)	7 months 17 days
Exercise Price Range, Lower Range Limit	$ 10.00
Exercise Price Range, Upper Range Limit	$ 15.00
$15.00 - $20.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	276,269
Weighted Average Exercise Price	$ 18.12
Weighted Average Remaining Term (in years)	2 years 9 months
Exercise Price Range, Lower Range Limit	$ 15.00
Exercise Price Range, Upper Range Limit	$ 20.00
$20.00 - $25.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	127,876
Weighted Average Exercise Price	$ 23.51
Weighted Average Remaining Term (in years)	4 years 0 months 25 days
Exercise Price Range, Lower Range Limit	$ 20.00
Exercise Price Range, Upper Range Limit	$ 25.00
$25.00 - $30.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	800,000
Weighted Average Exercise Price	$ 25.91
Weighted Average Remaining Term (in years)	9 years 2 months 19 days
Exercise Price Range, Lower Range Limit	$ 25.00
Exercise Price Range, Upper Range Limit	$ 30.00
$30.00 - $35.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	0
Exercise Price Range, Lower Range Limit	$ 30.00
Exercise Price Range, Upper Range Limit	$ 35.00
$35.00 - $40.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	0
Exercise Price Range, Lower Range Limit	$ 35.00
Exercise Price Range, Upper Range Limit	$ 40.00
$40.00 - $45.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	0
Exercise Price Range, Lower Range Limit	$ 40.00
Exercise Price Range, Upper Range Limit	$ 45.00
$45.00 - $50.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	0
Exercise Price Range, Lower Range Limit	$ 45.00
Exercise Price Range, Upper Range Limit	$ 50.00
$50.00 - $55.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	229,725
Weighted Average Exercise Price	$ 54.23
Weighted Average Remaining Term (in years)	3 years 5 months 26 days
Exercise Price Range, Lower Range Limit	$ 50.00
Exercise Price Range, Upper Range Limit	$ 55.00