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Derivatives and Hedging Activities - Additional Information (Detail) $ in Thousands, £ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Oct. 31, 2018 GBP (£) | Jul. 31, 2018 USD ($)
Summary |  |  |  |
Derivative maturity | 18 months |  |  |
Derivative, Notional Amount | $ 23,619 |  |  | $ 32,667
Summary of Cash Flow Hedge Activity |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | (590) | $ 710 |  |
Cash Flow Hedge Gain (Loss) Reclassified from OCI to Earnings | (47) | 24 |  |
Total Outstanding Forward Foreign Exchange Contracts | 20,398 |  |  |
Summary of Derivative Instruments Not Designated as Hedging Instruments |  |  |  |
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | $ (33) | $ (22) |  |
Senior Unsecured Notes [Member] |  |  |  |
Summary of Net Investment Hedge Activity |  |  |  |
Net investment hedges to hedge portions of net investment | £ |  |  | £ 45 |

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