Awards Granted to Company Employees and Non-employee Directors Under the 2007 Equity Incentive Compensation Plan (Detail) (USD $)	3 Months Ended
	Dec. 31, 2013
Non-qualified stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	315,226
Weighted-Average Grant Date Fair Value	$ 43.41
Weighted-Average Exercise Price	$ 197.39
Restricted stock awards (RSAs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	494,621
Weighted-Average Grant Date Fair Value	$ 197.39
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	221,103
Weighted-Average Grant Date Fair Value	$ 197.39
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.