SEGMENT INFORMATION - Summarized Financial Information of Net Revenue from External Customers by Group of Services (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	$ 120,638	$ 156,047	$ 246,051	$ 325,981
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	80,022	108,280	171,528	229,763
China
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	19,423	22,409	35,389	42,049
Netherlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	6,227	5,387	11,876	13,182
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	14,966	19,971	27,258	40,987
Direct Marketing
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	66,316	91,155	147,375	196,863
Supply Chain
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	$ 54,322	$ 64,892	$ 98,676	$ 129,118