Expected Reduction of Revenue for Volume and Support Incentive Agreements (Detail) $ in Millions	12 Months Ended
Sep. 30, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Client incentives, 2016	$ 3,237
Client incentives, 2017	3,130
Client incentives, 2018	2,670
Client incentives, 2019	2,205
Client incentives, 2020	1,610
Client incentives, Thereafter	3,965
Client incentives	$ 16,817

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Expected Reduction Of Volume And Support Incentives

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Expected Reduction Of Volume And Support Incentives Thereafter

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Expected Reduction Of Volume And Support Incentives Year Five

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Expected Reduction Of Volume And Support Incentives Year Four

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Expected Reduction Of Volume And Support Incentives Year One

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Expected Reduction Of Volume And Support Incentives Year Two

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