DERIVATIVES AND HEDGING - Fair Value of Our Derivative Instruments and the Associated Notional Amounts (Details) - Interest Rate Swap Agreements - Designated as Hedging Instrument - USD ($) $ in Thousands	Jul. 31, 2020	Jul. 31, 2019
Derivative [Line Items]
Notional	$ 673,400	$ 849,550
Fair Value in Other Current Liabilities	$ 24,840	$ 12,463