GOODWILL AND INTANGIBLE ASSETS Schedule of amortization expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 4,182	$ 6,531	$ 16,076	$ 20,719
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	4,182	4,825	13,511	15,589
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 0	$ 1,706	$ 2,565	$ 5,130

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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