REVENUE RECOGNITION - Impact of the Adoption on Consolidated Statement of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total net revenue	$ 819,830	$ 645,258
Cost of revenue	670,100	543,999
Gross profit	149,730	101,259
Loss before income taxes	(62,099)	(35,288)
Net loss	(66,727)	36,715
Net loss attributable to common stockholders	$ (68,856)	$ 35,380
Basic and diluted net loss per share attributable to common stockholders (usd per share)	$ (1.13)
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total net revenue	$ 818,134
Cost of revenue	669,154
Gross profit	148,980
Loss before income taxes	(62,849)
Net loss	(67,477)
Net loss attributable to common stockholders	$ (69,606)
Basic and diluted net loss per share attributable to common stockholders (usd per share)	$ (1.14)
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total net revenue	$ 1,696
Cost of revenue	946
Gross profit	750
Loss before income taxes	750
Net loss	750
Net loss attributable to common stockholders	$ 750
Basic and diluted net loss per share attributable to common stockholders (usd per share)	$ 0.01