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Derivatives and Hedging Activities - Fair Values of Derivative Instruments in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Apr. 30, 2020 | Jul. 31, 2019
Derivatives, Fair Value [Line Items] |  |
Document Period End Date | Apr. 30, 2020 |
Prepaid expenses and other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | $ 241 | $ 474
Other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 1,360 | 5
Long-term Debt [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 48,929 | 50,189
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Prepaid expenses and other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 176 | 472
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 0 | 0
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Long-term Debt [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 0 | 0
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Prepaid expenses and other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 0 | 0
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 0 | 0
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Long-term Debt [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 48,929 | 50,189
Not designated as hedging Instruments [Member] | Cash Flow Hedging [Member] | Prepaid expenses and other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 65 | 2
Not designated as hedging Instruments [Member] | Cash Flow Hedging [Member] | Other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 1,360 | 5
Not designated as hedging Instruments [Member] | Cash Flow Hedging [Member] | Long-term Debt [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | $ 0 | $ 0

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