Financial Derivatives and Hedging - Schedule of Fair Values of Derivative Instruments in Condensed Consolidated Balance Sheets (Details) - Designated as Hedging Instrument - Interest Rate Swap - USD ($)	Jul. 31, 2020	Jul. 31, 2019
Derivatives, Fair Value [Line Items]
Interest rate swap contracts	$ 23,800,000	$ 0
Other current liabilities
Derivatives, Fair Value [Line Items]
Interest rate swap contracts	700,000	0
Other non-current liabilities
Derivatives, Fair Value [Line Items]
Interest rate swap contracts	$ 23,100,000	$ 0