REVENUE RECOGNITION - Impact of the Adoption on Consolidated Statement of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenue	$ 194,003	$ 193,921	$ 615,359	$ 450,181
Cost of revenue	157,142	154,916	502,755	386,279
Gross profit	36,861	39,005	112,604	63,902
Loss before income taxes	(8,229)	(9,818)	(24,831)	(28,072)
Net loss	(9,627)	(10,333)	(28,745)	44,248
Net loss attributable to common stockholders	$ (10,152)	$ (10,862)	$ (30,343)	$ 43,449
Basic and diluted net loss per share attributable to common stockholders (usd per share)	$ (0.17)	$ (0.18)	$ (0.50)	$ 0.75
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenue	$ 191,514		$ 613,248
Cost of revenue	155,482		501,442
Gross profit	36,032		111,806
Loss before income taxes	(9,058)		(25,629)
Net loss	(10,456)		(29,543)
Net loss attributable to common stockholders	$ (10,981)		$ (31,141)
Basic and diluted net loss per share attributable to common stockholders (usd per share)	$ (0.18)		$ (0.51)
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]
Net revenue	$ 2,489		$ 2,111
Cost of revenue	1,660		1,313
Gross profit	829		798
Loss before income taxes	829		798
Net loss	829		798
Net loss attributable to common stockholders	$ 829		$ 798
Basic and diluted net loss per share attributable to common stockholders (usd per share)	$ 0.01		$ 0.01