CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
Cash flows from operating activities:
Net loss	$ (429,952,000)	$ (317,816,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	48,804,000	40,221,000
Non-cash operating lease costs	17,842,000	13,722,000
Amortization of deferred commissions	25,796,000	22,764,000
Stock-based compensation, net of amounts capitalized	379,460,000	331,936,000
Net accretion of discounts on investments	(7,652,000)	(11,992,000)
Net realized and unrealized losses on strategic investments in equity securities	29,685,000	20,695,000
Amortization of debt issuance costs	2,071,000	0
Asset impairment related to office facility exit	106,488,000	0
Other	(5,174,000)	669,000
Changes in operating assets and liabilities:
Accounts receivable	393,657,000	579,319,000
Deferred commissions	(31,114,000)	(14,940,000)
Prepaid expenses and other assets	(17,852,000)	(1,111,000)
Accounts payable	(4,423,000)	21,244,000
Accrued expenses and other liabilities	3,935,000	(54,688,000)
Operating lease liabilities	(11,838,000)	(13,374,000)
Deferred revenue	(271,360,000)	(261,181,000)
Net cash provided by operating activities	228,373,000	355,468,000
Cash flows from investing activities:
Purchases of property and equipment	(44,989,000)	(16,519,000)
Capitalized internal-use software development costs	0	(7,404,000)
Purchases of investments	(1,012,575,000)	(1,078,261,000)
Sales of investments	17,399,000	30,360,000
Maturities and redemptions of investments	984,182,000	921,395,000
Settlement of cash flow hedges	0	(749,000)
Net cash used in investing activities	(55,983,000)	(151,178,000)
Cash flows from financing activities:
Proceeds from exercise of stock options	6,260,000	10,686,000
Proceeds from issuance of common stock under employee stock purchase plan	53,193,000	46,735,000
Taxes paid related to net share settlement of equity awards	(132,498,000)	(174,590,000)
Repurchases of common stock	(490,638,000)	(516,329,000)
Payments of deferred purchase consideration for a business combination	(374,000)	0
Net cash used in financing activities	(564,057,000)	(633,498,000)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	12,397,000	(2,633,000)
Net decrease in cash, cash equivalents, and restricted cash	(379,270,000)	(431,841,000)
Cash, cash equivalents, and restricted cash—beginning of period	2,698,678,000	1,780,977,000
Cash, cash equivalents, and restricted cash—end of period	2,319,408,000	1,349,136,000
Supplemental disclosures of non-cash investing and financing activities:
Property and equipment included in accounts payable and accrued expenses	32,184,000	16,793,000
Stock-based compensation included in capitalized internal-use software development costs	0	9,295,000
Unpaid taxes related to net share settlement of equity awards included in accrued expenses and other current liabilities	6,109,000	9,354,000
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	2,243,083,000	1,330,411,000
Restricted cash—included in other assets and prepaid expenses and other current assets	76,325,000	18,725,000
Total cash, cash equivalents, and restricted cash	$ 2,319,408,000	$ 1,349,136,000