Share-Based Compensation - Options by Exercise Price (Details) (USD $)	12 Months Ended
	Sep. 30, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	1,578,056
Weighted Average Exercise Price	$ 25.38
Weighted Average Remaining Term (in years)	4 years 1 month 28 days
$0 - $5,00 [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	$ 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	180,315
Weighted Average Exercise Price	$ 6.92
Weighted Average Remaining Term (in years)	2 months 5 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	0
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	362,756
Weighted Average Exercise Price	$ 18.51
Weighted Average Remaining Term (in years)	1 year 11 months 23 days
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	118,889
Weighted Average Exercise Price	$ 23.53
Weighted Average Remaining Term (in years)	2 years 2 months 19 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	720,000
Weighted Average Exercise Price	$ 25.91
Weighted Average Remaining Term (in years)	7 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	196,096
Weighted Average Exercise Price	$ 54.23
Weighted Average Remaining Term (in years)	1 year 9 months 18 days
Exercise Price Range, Lower Range Limit	$ 50.00
Exercise Price Range, Upper Range Limit	$ 55.00