CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		3 Months Ended				6 Months Ended		12 Months Ended
		Jan. 31, 2023	Oct. 31, 2022	Jan. 31, 2022	Oct. 31, 2021	Jan. 31, 2023	Jan. 31, 2022	Jul. 31, 2022
Cash flows from operating activities:
Net loss		$ (70,790)	$ (99,514)	$ (115,416)	$ (420,206)	$ (170,304)	$ (535,622)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization						39,479	45,582
Stock-based compensation						166,245	178,592
Change in fair value of derivative liability						0	198,038
Loss on debt extinguishment						0	64,910
Amortization of debt discount and issuance costs						21,082	19,796
Operating lease cost, net of accretion						18,158	18,336
Early exit of lease-related assets						(1,109)	0
Non-cash interest expense						9,817	9,575
Other						(2,427)	5,156
Changes in operating assets and liabilities:
Accounts receivable, net						(28,649)	23,826
Deferred commissions						19,110	(13,332)
Prepaid expenses and other assets						(28,348)	(4,951)
Accounts payable						(3,171)	(2,391)
Accrued compensation and benefits						(11,467)	(19,496)
Accrued expenses and other liabilities						52,423	(2,662)
Operating leases, net						(19,965)	(23,619)
Deferred revenue						78,723	70,968
Net cash (used in) provided by operating activities						139,597	32,706
Cash flows from investing activities:
Maturities of investments						529,112	568,697
Purchases of investments						(508,984)	(556,148)
Sales of investments						0	17,999
Purchases of property and equipment						(30,772)	(17,390)
Net cash used in investing activities						(10,644)	13,158
Cash flows from financing activities:
Repayment of convertible notes						(145,704)	0
Payments of debt extinguishment costs						0	(14,709)
Proceeds from unwinding of convertible note hedges						0	39,880
Payments for unwinding of warrants						0	(18,390)
Proceeds from sales of shares through employee equity incentive plans						22,896	32,053
Proceeds from the issuance of convertible notes, net of issuance costs						0	89,128
Repurchases of common stock						0	(58,570)
Payment of finance lease obligations						(2,344)	(323)
Net cash provided by (used in) financing activities						(125,152)	69,069
Net (decrease) increase in cash, cash equivalents and restricted cash						3,801	114,933
Cash, cash equivalents and restricted cash—beginning of period			$ 405,862		$ 288,873	405,862	288,873	$ 288,873
Cash, cash equivalents and restricted cash—end of period		409,663		403,806		409,663	403,806	405,862
Restricted cash	[1]	3,062		3,057		3,062	3,057
Cash and cash equivalents—end of period		$ 406,601		$ 400,749		406,601	400,749	$ 402,850
Supplemental disclosures of cash flow information:
Cash paid for income taxes						16,191	12,084
Supplemental disclosures of non-cash investing and financing information:
Purchases of property and equipment included in accounts payable and accrued and other liabilities						18,646	18,939
Finance lease liabilities arising from obtaining right-of-use assets						9,567	11,148
Convertible senior notes offering costs included in accrued liabilities						$ 0	$ 693

[1] Included within other assets—non-current in the condensed consolidated balance sheets.