SEGMENT INFORMATION - Summarized Financial Information of Net Revenue from External Customers by Group of Services (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	$ 125,413	$ 169,934
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	91,506	121,483
China
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	15,966	19,640
Netherlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	5,649	7,795
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	12,292	21,016
Direct Marketing
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	81,059	105,708
Supply Chain
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	$ 44,354	$ 64,226