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Derivatives and Hedging Activities - Additional Information (Detail) $ in Thousands, £ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2018 USD ($) | Jan. 31, 2017 USD ($) | Jan. 31, 2018 USD ($) | Jan. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) | May 13, 2010 GBP (£)
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Maturities |  |  | 18 months |  |  |
Derivative, Notional Amount | $ 18,236 |  | $ 18,236 |  | $ 81,195 |
Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | (856) | $ (451) | (856) | $ (451) |  |
Cash Flow Hedge Gain (Loss) Reclassified to Earnings | (158) | (10) | (182) | (415) |  |
Total Outstanding Forward Foreign Exchange Contracts | 15,043 |  | 15,043 |  |  |
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | $ (2) | $ (3,313) | $ 20 | $ (5,046) |  |
Senior Unsecured Notes [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Amount of Hedged Item | £ |  |  |  |  |  | £ 45

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument. + References No definition available. + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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