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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Total revenue	$ 303,748	$ 289,413	$ 286,744	$ 275,552	$ 252,458	$ 205,670	$ 199,214	$ 188,561	$ 1,155,457	$ 845,903	$ 503,410
Total cost of revenue	73,265	95,615	108,528	108,622	97,517	83,206	76,846	69,762	386,030	327,331	170,787
Gross profit	230,483	193,798	178,216	166,930	154,941	122,464	122,368	118,799	769,427	518,572	332,623
Sales and marketing	183,191	169,860	151,201	145,405	134,276	126,746	111,374	128,625	649,657	501,021	286,584
Research and development	97,050	81,291	70,924	64,512	67,817	74,607	70,914	75,281	313,777	288,619	116,400
General and administrative	29,472	24,929	15,948	16,052	16,878	15,610	15,481	29,372	86,401	77,341	34,265
Total operating expenses	309,713	276,080	238,073	225,969	218,971	216,963	197,769	233,278	1,049,835	866,981	437,249
Loss from operations	(79,230)	(82,282)	(59,857)	(59,039)	(64,030)	(94,499)	(75,401)	(114,479)	(280,408)	(348,409)	(104,626)
Other expense, net	(4,021)	(4,235)	(861)	(189)	(547)	303	(421)	(25,712)	(9,306)	(26,377)	(1,290)
Loss before provision for income taxes	(83,251)	(86,517)	(60,718)	(59,228)	(64,577)	(94,196)	(75,822)	(140,191)	(289,714)	(374,786)	(105,916)
Provision for income taxes	4,118	(843)	1,913	2,259	1,555	2,639	547	111	7,447	4,852	2,317
Net loss	$ (87,369)	$ (85,674)	$ (62,631)	$ (61,487)	$ (66,132)	$ (96,835)	$ (76,369)	$ (140,302)	$ (297,161)	$ (379,638)	$ (108,233)
Net income (loss) per share attributable to common stockholders—basic and diluted (in dollars per share)	$ (0.51)	$ (0.51)	$ (0.39)	$ (0.39)	$ (0.43)	$ (0.67)	$ (0.54)	$ (1.89)	$ (1.81)	$ (2.96)	$ (2.46)
Total stock-based compensation expense	$ 55,396	$ 44,946	$ 42,011	$ 35,515	$ 37,805	$ 50,351	$ 52,607	$ 90,728	$ 177,868	$ 231,491	$ 20,056
Amortization of intangible assets	2,424	1,669	1,356	1,106	608	608	608	405	6,555	2,229
Cost of product revenue
Condensed Financial Statements, Captions [Line Items]
Total stock-based compensation expense	692	634	684	570	642	610	848	966
Amortization of intangible assets	2,135	1,447	1,164	895	358	358	360	238
Cost of revenue, support and other services
Condensed Financial Statements, Captions [Line Items]
Total stock-based compensation expense	2,789	1,951	2,133	2,072	2,201	2,471	2,389	3,350	8,945	10,411	968
Sales and marketing
Condensed Financial Statements, Captions [Line Items]
Total stock-based compensation expense	17,301	18,051	15,942	13,766	12,972	15,726	15,528	33,891	65,060	78,117	8,006
Amortization of intangible assets	289	222	192	211	250	250	248	167
Research and development
Condensed Financial Statements, Captions [Line Items]
Total stock-based compensation expense	25,350	16,474	17,023	15,542	19,218	27,041	28,759	34,026	74,389	109,044	6,259
General and administrative
Condensed Financial Statements, Captions [Line Items]
Total stock-based compensation expense	9,264	7,836	6,229	3,565	2,772	4,503	5,083	18,495	26,894	30,853	4,432
Product
Condensed Financial Statements, Captions [Line Items]
Total revenue	224,650	221,117	223,170	219,052	201,472	160,076	158,213	153,536	887,989	673,297	413,910
Total cost of revenue	41,068	66,680	83,217	85,162	76,187	62,593	58,403	52,210	276,127	249,393	133,541
Support, entitlements and other services
Condensed Financial Statements, Captions [Line Items]
Total revenue	79,098	68,296	63,574	56,500	50,986	45,594	41,001	35,025	267,468	172,606	89,500
Total cost of revenue	$ 32,197	$ 28,935	$ 25,311	$ 23,460	$ 21,330	$ 20,613	$ 18,443	$ 17,552	$ 109,903	$ 77,938	$ 37,246

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