Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (54,469)	$ (3,884)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	16,315	6,383
Stock-based compensation	44,655	36,464
Deferred tax assets	24,287	(5,617)
Amortization of premium on available-for-sale securities	361	868
Changes in operating assets and liabilities:
Accounts receivable	(16,345)	(823)
Prepaid expenses and other assets	(3,139)	(3,689)
Accounts payable	4,834	(1,715)
Accrued employee compensation	(17,547)	(15,084)
Other liabilities	804	(615)
Deferred revenues	16,690	17,361
Net cash used in operating activities	16,446	29,649
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of available-for-sale securities	(110,820)	(291,611)
Sales of available-for-sale securities	170,316	298,671
Purchase of property and equipment	(4,620)	(2,617)
Capitalized software development costs	(769)	0
Payments to Acquire Businesses, Net of Cash Acquired	(130,376)	(33,534)
Net cash used in investing activities	(76,269)	(29,091)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock upon exercise of stock options	727	2,034
Net cash provided by financing activities	727	2,034
Effect of foreign exchange rate changes on cash and cash equivalents	1,207	(811)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(57,889)	1,781
CASH AND CASH EQUIVALENTS—Beginning of period	263,176	223,582
CASH AND CASH EQUIVALENTS—End of period	205,287	225,363
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes	1,677	2,256
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Accruals for purchase of property and equipment	$ 1,497	$ 521