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Derivatives and Hedging Activities - Additional Information (Detail) £ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2020 USD ($) | Apr. 30, 2019 USD ($) | Apr. 30, 2020 USD ($) | Apr. 30, 2019 USD ($) | Jul. 31, 2019 USD ($) | Jul. 31, 2018 USD ($) | May 13, 2010 GBP (£)
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Document Period End Date |  |  | Apr. 30, 2020 |  |  |  |
Derivative Maturities |  |  | 18 months |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | $ (1,166,000) |  | $ (1,166,000) |  | $ (805,000) |  |
Cash Flow Hedge Gain (Loss) Reclassified to Earnings | 293,000 | $ 292,000 | 779,000 | $ 579,000 |  |  |
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | 39,000 | $ (6,000) | 11,000 | $ (49,000) |  |  |
Accumulated other comprehensive loss | (92,242,000) |  | (92,242,000) |  | (71,254,000) | $ (56,401,000) |
Senior Unsecured Notes [Member] |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative, Amount of Hedged Item | £ |  |  |  |  |  |  | £ 45,000
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Accumulated other comprehensive loss | $ 13,700,000 |  | $ 13,700,000 |  | $ 12,440,000 |  |

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