SEGMENT INFORMATION - Summarized Financial Information of Net Revenue from External Customers by Group of Services (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	$ 151,785	$ 177,351	$ 477,766	$ 617,956
Direct Marketing
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	102,351	98,284	299,214	354,404
Supply Chain
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	49,434	79,067	178,552	263,552
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	115,646	117,315	345,409	417,028
China
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	15,220	28,100	57,269	99,898
Netherlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	6,149	9,467	19,331	31,185
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	$ 14,770	$ 22,469	$ 55,757	$ 69,845