CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Cash flows from operating activities
Net income	$ 135,158	$ 108,457	$ 378,307	$ 299,173
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,364	7,157	24,000	21,443
Reduction of operating lease right-of-use assets	2,860	3,094	8,885	9,062
Accretion of discount on short-term investments	(8,515)	(1,565)	(19,298)	(1,016)
Stock-based compensation	101,226	93,187	294,840	256,363
Amortization of deferred costs	3,542	5,378	12,843	17,107
Deferred income taxes	(33,405)	(31,056)	(80,132)	(84,369)
Loss on foreign currency from mark-to-market derivative	1,388	7	841	1,193
Bad debt expense	134	1,089	630	1,210
Changes in operating assets and liabilities:
Accounts receivable	123,428	69,272	446,921	387,066
Unbilled accounts receivable	(7,296)	(4,307)	37,337	(18,819)
Deferred costs	(812)	(5,376)	(751)	(11,876)
Prepaid expenses and other current and long-term assets	(16,051)	7,326	(6,806)	(3,750)
Accounts payable	(13,556)	10,002	(5,502)	20,663
Accrued expenses and other current liabilities	(8,443)	5,465	(9,572)	2,654
Income taxes payable	(17,583)	49,323	1,614	46,705
Deferred revenue	(192,037)	(174,544)	(228,120)	(222,013)
Operating lease liabilities	27	(2,624)	(4,263)	(7,736)
Other long-term liabilities	4,169	2,375	1,796	4,013
Net cash provided by operating activities	82,598	142,660	853,570	717,073
Cash flows from investing activities
Purchases of short-term investments	(541,502)	(710,833)	(2,142,068)	(1,716,250)
Maturities and sales of short-term investments	474,088	310,713	1,170,881	757,434
Long-term assets	(5,910)	(5,609)	(18,461)	(9,605)
Net cash used in investing activities	(73,324)	(405,729)	(989,648)	(968,421)
Cash flows from financing activities
Proceeds from exercise of common stock options	13,956	4,575	52,184	30,116
Taxes paid related to net share settlement of equity awards	(20,845)	(15,118)	(57,888)	(47,251)
Net cash used in financing activities	(6,889)	(10,543)	(5,704)	(17,135)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(1,282)	(1,475)	(973)	(4,398)
Net change in cash, cash equivalents, and restricted cash	1,103	(275,087)	(142,755)	(272,881)
Cash, cash equivalents, and restricted cash at beginning of period	745,792	1,143,431	889,650	1,141,225
Cash, cash equivalents, and restricted cash at end of period	746,895	868,344	746,895	868,344
Cash, cash equivalents, and restricted cash at end of period:
Cash and cash equivalents	743,712	865,159	743,712	865,159
Restricted cash included in other long-term assets	3,183	3,185	3,183	3,185
Cash, cash equivalents, and restricted cash at end of period	746,895	868,344	746,895	868,344
Supplemental disclosures of other cash flow information:
Cash paid for income taxes, net of refunds	93,590	2,936	100,856	110,708
Excess tax benefits from employee stock plans	3,275	888	68,575	5,981
Non-cash investing activities:
Changes in accounts payable and accrued expenses related to property and equipment purchases	$ 1,146	$ (17)	$ 100	$ (458)