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Stock Option and Incentive Plan - Summary of Option Activity (Detail)
shares in Thousands
12 Months Ended
Sep. 30, 2015
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of Share Options, Outstanding, Beginning Balance | shares 9,563
Number of Share Options, Granted | shares 2,418
Number of Share Options, Exercised | shares (2,540)
Number of Share Options, Forfeited | shares (569)
Number of Share Options, Outstanding, Ending Balance | shares 8,872
Number of Share Options, Exercisable | shares 3,230
Weighted Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 33.72
Weighted Average Exercise Price, Granted | $ / shares 49.49
Weighted Average Exercise Price, Exercised | $ / shares 30.94
Weighted Average Exercise Price, Forfeited | $ / shares 37.40
Weighted Average Exercise Price, Outstanding, Ending Balance | $ / shares 38.58
Weighted Average Exercise Price, Exercisable | $ / shares $ 31.99