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Derivatives and Hedging Activities - Additional Information (Detail) - USD ($)	3 Months Ended
	Oct. 31, 2020	Jul. 31, 2020	Oct. 31, 2019
Summary
Derivative maturity	18 months
Summary of Cash Flow Hedge Activity
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ (523)	$ 385
Cash Flow Hedge Gain (Loss) Reclassified from OCI to Earnings	211,000		$ (381,000)
Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets	1,017,000	594,000
Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	(449,000)	777,000
Unrealized (loss) gain on cash flow hedges \| Designated as hedging instruments [Member] \| Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets	1,017,000	588,000
Unrealized (loss) gain on cash flow hedges \| Designated as hedging instruments [Member] \| Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	(434,000)	761,000
Unrealized (loss) gain on cash flow hedges \| Not designated as hedging Instruments [Member \| Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets	0	6,000
Unrealized (loss) gain on cash flow hedges \| Not designated as hedging Instruments [Member \| Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	$ (15,000)	$ 16,000