Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (27,198)	$ 20,732	$ (26,743)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	42,641	39,953	35,611
Amortization of debt discount and issuance costs	12,886	12,194	4,512
Stock-based compensation	101,817	91,516	89,614
Charges to bad debt and revenue reserves	367	670	1,062
Deferred income tax	(11,859)	(13,998)	14,150
Amortization of premium (accretion of discount) on available-for-sale securities, net	(1,882)	(7,757)	(1,418)
Changes in fair value of strategic investment	10,672	0	0
Other non-cash items affecting net income (loss)	739	189	0
Changes in operating assets and liabilities:
Accounts receivable	23,878	(15,057)	(40,832)
Unbilled accounts receivable	(38,125)	(17,341)	0
Prepaid expenses and other assets	(8,672)	(16,251)	(2,737)
Operating lease assets	(10,784)
Accounts payable	(1,209)	(5,521)	16,794
Accrued employee compensation	(15,624)	13,825	9,230
Deferred revenue	1,165	(9,628)	32,358
Lease liabilities	18,678
Other liabilities	15,576	22,600	8,858
Net cash provided by (used in) operating activities	113,066	116,126	140,459
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of available-for-sale securities	(1,280,755)	(1,209,312)	(859,657)
Sales of available-for-sale securities	134,050	77,204	74,118
Maturities of available-for-sale securities	1,168,720	879,532	390,025
Purchases of property and equipment	(21,377)	(44,921)	(9,398)
Capitalized software development costs	(4,283)	(3,936)	(2,613)
Acquisitions of business, net of acquired cash	0	0	(130,059)
Purchases of strategic investments	(2,156)	0	0
Net cash provided by (used in) investing activities	(5,801)	(301,433)	(537,584)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of convertible senior notes, net of issuance costs	0	0	387,239
Proceeds from issuance of common stock, net of issuance costs	0	0	220,948
Purchase of capped calls	0	0	(37,200)
Proceeds from issuance of common stock upon exercise of stock options	4,955	3,954	2,013
Net cash provided by (used in) financing activities	4,955	3,954	573,000
Effect of foreign exchange rate changes on cash and cash equivalents	648	(1,686)	(1,911)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	112,868	(183,039)	173,964
CASH AND CASH EQUIVALENTS—Beginning of period	254,101	437,140	263,176
CASH AND CASH EQUIVALENTS—End of period	366,969	254,101	437,140
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest	5,000	5,036	0
Cash paid for income taxes, net of tax refunds	4,888	4,557	4,744
Accruals for purchases of property and equipment	343	10,763	1,508
Accruals for capitalized software development costs	$ 406	$ 298	$ 189