FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
Apr. 30, 2021	Jul. 31, 2021	Jul. 31, 2020
Fair Value Disclosures [Abstract]
Impairment of goodwill	$ 25,700,000	$ 25,658,000	$ 0

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration