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Subsequent Events	12 Months Ended
Subsequent Events	Sep. 30, 2013
Subsequent Events [Abstract]
Subsequent Events	Note 21—Subsequent Events In October 2013, the Company’s board of directors authorized an additional $5.0 billion share repurchase program. See Note 14—Stockholders' Equity. In October 2013, the Company’s board of directors declared a dividend in the aggregate amount of $0.40 per share of class A common stock (determined in the case of class B and class C common stock on an as-converted basis). See Note 14—Stockholders' Equity.