REVENUE, DEFERRED REVENUE AND DEFERRED COMMISSIONS - Schedule of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Apr. 30, 2018	Apr. 30, 2017		Apr. 30, 2018	Apr. 30, 2017
Condensed Income Statements, Captions [Line Items]
Sales revenue, goods	$ 221,117	$ 160,076	[1]	$ 663,339	$ 471,825	[1]
Support, entitlements and other services	68,296	45,594	[1]	188,370	121,620	[1]
Total revenue	289,413	205,670	[1]	851,709	593,445	[1]
Software
Condensed Income Statements, Captions [Line Items]
Sales revenue, goods	158,500	100,810		441,885	308,400
Hardware
Condensed Income Statements, Captions [Line Items]
Sales revenue, goods	$ 62,617	59,266		$ 221,454	163,425
Accounting Standards Update 2014-09
Condensed Income Statements, Captions [Line Items]
Sales revenue, goods		160,076			471,825
Support, entitlements and other services		45,594			121,620
Total revenue		$ 205,670			$ 593,445

[1] See Note 3 for a summary of adjustments related to the adoption of the new revenue recognition standard.