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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, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Client incentives, 2018 | $ 5,049
Client incentives, 2019 | 4,654
Client incentives, 2020 | 4,117
Client incentives, 2021 | 3,658
Client incentives, 2022 | 3,102
Client incentives, Thereafter | 5,080
Client incentives | $ 25,660

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