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Derivative Instruments and Hedging Activities, Estimated Fair Value of Derivative Instruments (Details) - Interest Rate Swaps [Member] - USD ($)
$ in Thousands
Apr. 30, 2021
Jul. 31, 2020
Estimated Fair Value of Derivative Instruments [Abstract]    
Fair value, liability [1] $ 18,442 $ 27,746
Other Current Liabilities [Member]    
Estimated Fair Value of Derivative Instruments [Abstract]    
Fair value, liability [1] 54 3,886
Long-term Interest Rate Swap Liability [Member]    
Estimated Fair Value of Derivative Instruments [Abstract]    
Fair value, liability [1] $ 18,388 $ 23,860
[1] These interest rate swap liabilities are recorded gross at both April 30, 2021 and July 31, 2020 since there were no offsetting assets under the Company’s master netting agreements.