Share-based Compensation - Awards Granted to Company Employees and Non-employee Directors Under the 2007 Equity Incentive Compensation Plan (Detail)	3 Months Ended
	Dec. 31, 2015 $ / shares shares
Non-qualified stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted | shares	1,362,840
Weighted-Average Grant Date Fair Value	$ 15.09
Weighted-Average Exercise Price	$ 80.15
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted | shares	2,346,825
Weighted-Average Grant Date Fair Value	$ 80.15
Performance-bases shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted | shares	604,219	[1]
Weighted-Average Grant Date Fair Value	$ 92.71	[1]

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