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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Apr. 30, 2024
Apr. 30, 2023
Cash flows from operating activities    
Net income $ 161,664 $ 131,521
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 8,499 7,549
Reduction of operating lease right-of-use assets 2,783 3,060
Accretion of discount on short-term investments (6,187) (3,407)
Stock-based compensation 95,911 90,719
Amortization of deferred costs 3,803 5,052
Deferred income taxes (26,539) (21,514)
Loss on foreign currency from mark-to-market derivative 1,082 180
Bad debt (recovery) expense (152) 155
Changes in operating assets and liabilities:    
Accounts receivable 490,004 289,960
Unbilled accounts receivable (2,406) 44,104
Deferred costs (3,854) 3,607
Prepaid expenses and other current and long-term assets 8,160 (36,298)
Accounts payable 280 1,955
Accrued expenses and other current liabilities 2,597 (3,344)
Income taxes payable 59,705 (329)
Deferred revenue (31,292) (1,221)
Operating lease liabilities (1,643) (2,693)
Other long-term liabilities 1,101 (3,120)
Net cash provided by operating activities 763,516 505,936
Cash flows from investing activities    
Purchases of short-term investments (777,831) (612,492)
Maturities and sales of short-term investments 513,929 318,056
Long-term assets (8,476) (2,958)
Net cash used in investing activities (272,378) (297,394)
Cash flows from financing activities    
Proceeds from exercise of common stock options 28,434 15,233
Taxes paid related to net share settlement of equity awards (24,606) (16,625)
Net cash provided by (used in) financing activities 3,828 (1,392)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash (1,257) 19
Net change in cash, cash equivalents, and restricted cash 493,709 207,169
Cash, cash equivalents, and restricted cash at beginning of period 706,670 889,650
Cash, cash equivalents, and restricted cash at end of period 1,200,379 1,096,819
Cash, cash equivalents, and restricted cash at end of period:    
Cash and cash equivalents 1,197,196 1,093,634
Restricted cash included in other long-term assets 3,183 3,185
Cash, cash equivalents, and restricted cash at end of period 1,200,379 1,096,819
Supplemental disclosures of other cash flow information:    
Cash paid for income taxes, net of refunds 4,229 1,034
Excess tax benefits from employee stock plans $ 3,121 $ 62,089