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Derivatives and Hedging Activities - Fair Values of Derivative Instruments in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jan. 31, 2020 | Jul. 31, 2019
Derivatives, Fair Value [Line Items] |  |
Document Period End Date | Jan. 31, 2020 |
Prepaid expenses and other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | $ 740 | $ 474
Other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 33 | 5
Long-term Debt [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 49,635 | 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 | 727 | 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 | 49,635 | 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 | 13 | 2
Not designated as hedging Instruments [Member] | Cash Flow Hedging [Member] | Other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 33 | 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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