REVENUE, DEFERRED REVENUE AND DEFERRED COMMISSIONS - Deferred Revenue/Commissions (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Movement in Deferred Revenue [Roll Forward]
Deferred revenue, beginning balance	$ 779,859	$ 701,800	$ 631,207		$ 631,207
Additions	161,233	176,487	159,210
Revenue recognized	(102,830)	(98,428)	(88,937)
Assumed in a business combination			320
Deferred revenue, ending balance	838,262	779,859	701,800		838,262
Movement in Deferred Commissions [Roll Forward]
Deferred commissions, beginning balance	130,034	122,107	114,379		114,379
Additions	38,396	37,280	33,958
Commissions recognized	(29,232)	(29,353)	(26,230)
Assumed in a business combination			0
Deferred commissions, ending balance	139,198	$ 130,034	$ 122,107		139,198
Revenue recognized, amount deferred in prior period	89,800			$ 49,400	216,300	$ 136,800
Contracted revenue not recognized	$ 845,700				$ 845,700
Percent expected to be recognized in next year	43.00%				43.00%