SEGMENT INFORMATION - Summarized Financial Information of Net Revenue from External Customers by Group of Services (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	$ 156,047	$ 215,452	$ 325,981	$ 440,605
Direct Marketing
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	91,155	123,117	196,863	256,120
Supply Chain
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	64,892	92,335	129,118	184,485
Direct Marketing
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	91,155	123,117	196,863	256,120
Supply Chain
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	64,892	92,335	129,118	184,485
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	108,280	145,293	229,763	299,714
China
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	22,409	32,569	42,049	72,026
Netherlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	5,387	11,071	13,182	21,719
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from contracts with customers	$ 19,971	$ 26,519	$ 40,987	$ 47,146