Basic and Diluted Earnings Per Share (Parenthetical) (Detail)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2011
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Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] | |||
Dilutive shares of outstanding stock awards included in computation of weighted-average dilutive shares outstanding | 2 | 3 | 3 |
Stock options excluded from computation of average dilutive shares outstanding | 2 | ||
Maximum
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Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] | |||
Stock options excluded from computation of average dilutive shares outstanding | 1 | 1 | |
Class B common stock
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Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] | |||
Weighted average numbers of shares of class B common stock outstanding on an as-converted basis used in the allocation of net income | 103 | 108 | 123 |