SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Oct. 31, 2019	Jul. 31, 2020	Jul. 31, 2019	Aug. 01, 2019
Significant Of Accounting Policies [Line Items]
Operating expenses		$ 130,516,000	$ 175,009,000
Net loss		$ (5,284,000)	$ (66,727,000)
Highly liquid investment period to be considered cash equivalent		3 months
Goodwill impairment loss		$ 0
Operating right-of-use assets		$ 56,140,000
Ten Largest Clients | Sales Revenue, Net | Customer Concentration Risk
Significant Of Accounting Policies [Line Items]
Concentration risk percentage		57.00%	49.00%
Computing Market Client | Net Accounts Receivable | Customer Concentration Risk
Significant Of Accounting Policies [Line Items]
Concentration risk percentage			11.00%
Minimum
Significant Of Accounting Policies [Line Items]
Highly liquid investment period to be considered short term investments		3 months
Maximum
Significant Of Accounting Policies [Line Items]
Highly liquid investment period to be considered short term investments		12 months
Supply Chain | One Customer | Sales Revenue, Net | Customer Concentration Risk
Significant Of Accounting Policies [Line Items]
Concentration risk percentage		17.00%	11.00%
Accounting Standards Update 2016-02
Significant Of Accounting Policies [Line Items]
Operating right-of-use assets				$ 51,100,000
Lease liability				$ 53,100,000
Adjustment of Tax Related Liabilities
Significant Of Accounting Policies [Line Items]
Adjustments of tax related liabilities	$ 6,400,000
Adjustments
Significant Of Accounting Policies [Line Items]
Accrued expenses			$ 106,300,000
Adjustments | Net loss
Significant Of Accounting Policies [Line Items]
Net loss			60,300,000
Adjustments | Adjustment of Tax Related Liabilities | Operating Expense
Significant Of Accounting Policies [Line Items]
Operating expenses			$ 137,700,000