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Expected Reduction of Revenue for Volume and Support Incentive Agreements (Detail) $ in Millions | 12 Months Ended
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Sep. 30, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Client incentives, 2017 | $ 4,211
Client incentives, 2018 | 3,752
Client incentives, 2019 | 3,211
Client incentives, 2020 | 2,628
Client incentives, 2021 | 2,245
Client incentives, Thereafter | 4,617
Client incentives | $ 20,664

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