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