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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, 2021 | Jul. 31, 2020
Derivatives, Fair Value [Line Items] |  |
Document Period End Date | Jan. 31, 2021 |
Prepaid expenses and other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | $ 1,246 | $ 594
Other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 499 | 777
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Prepaid expenses and other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 1,241 | 588
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 499 | 761
Not designated as hedging Instruments [Member] | Cash Flow Hedging [Member] | Prepaid expenses and other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 5 | 6
Not designated as hedging Instruments [Member] | Cash Flow Hedging [Member] | Other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | $ 0 | $ 16

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