Awards Granted to Company Employees and Non-employee Directors Under the 2007 Equity Incentive Compensation Plan (Detail) (USD $)	6 Months Ended
	Mar. 31, 2014
Non-qualified stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	376,809
Weighted-Average Grant Date Fair Value	$ 44.23
Weighted-Average Exercise Price	$ 200.19
Restricted stock awards (RSAs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	537,244
Weighted-Average Grant Date Fair Value	$ 198.75
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	224,838
Weighted-Average Grant Date Fair Value	$ 197.67
Performance-based shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	278,451	[1]
Weighted-Average Grant Date Fair Value	$ 225.46	[1]

[1] Represents the maximum number of performance-based shares which could be earned.