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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Cash flows from operating activities:        
Net income (loss) $ 43,412 $ (24,340) $ 102,626 $ (210,724)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Depreciation and amortization 87,127 73,864 254,973 218,556
Share-based compensation expenses 278,995 259,832 808,349 747,740
Amortization of deferred costs 35,482 28,732 100,844 82,141
Amortization of debt discount and issuance costs 997 12,098 2,991 41,466
Non-cash lease expense 21,407 22,141 64,706 60,389
(Gains) losses on investments (25,222) (143) (125,479) 356
Other 3,411 (8,617) (7,216) 7,684
Changes in operating assets and liabilities, net of business combinations:        
Trade and other receivables, net 6,649 (53,923) 171,257 127,663
Deferred costs (50,654) (41,823) (129,758) (101,724)
Prepaid expenses and other assets 18,050 25,898 (21,047) 36,738
Accounts payable (12,007) 3,762 (4,117) (9,313)
Accrued expenses and other liabilities 2,498 (5,037) (24,109) (46,378)
Unearned revenue (25,491) 1,358 (158,465) (239,899)
Net cash provided by (used in) operating activities 384,654 293,802 1,035,555 714,695
Cash flows from investing activities:        
Purchases of marketable securities (722,275) (806,713) (2,317,040) (1,963,244)
Maturities of marketable securities 674,246 427,910 2,303,478 1,282,324
Sales of marketable securities 0 0 27,286 5,279
Owned real estate projects (4) (1,072) (171,498) (5,323)
Capital expenditures, excluding owned real estate projects (33,335) (78,197) (190,912) (204,692)
Business combinations, net of cash acquired (60,645) 0 (739,865) 0
Purchases of non-marketable equity and other investments (26,720) (4,618) (84,526) (63,218)
Sales and maturities of non-marketable equity and other investments 1,874 24 5,169 6,223
Other 0 0 1 0
Net cash provided by (used in) investing activities (166,859) (462,666) (1,167,907) (942,651)
Cash flows from financing activities:        
Proceeds from borrowings on Term Loan, net of debt discount and issuance costs 0 0 0 747,795
Payments on convertible senior notes (9) 0 (80) (249,946)
Payments on Term Loan (9,375) (9,375) (28,125) (9,375)
Proceeds from issuance of common stock from employee equity plans, net of taxes paid for shares withheld 1,894 3,650 76,381 78,167
Other (33) (181) (409) (2,436)
Net cash provided by (used in) financing activities (7,523) (5,906) 47,767 564,205
Effect of exchange rate changes 50 40 (85) 546
Net increase (decrease) in cash, cash equivalents, and restricted cash 210,322 (174,730) (84,670) 336,795
Cash, cash equivalents, and restricted cash at the beginning of period 1,092,929 1,246,246 1,387,921 734,721
Cash, cash equivalents, and restricted cash at the end of period 1,303,251 1,071,516 1,303,251 1,071,516
Supplemental cash flow data:        
Cash paid for interest 3,837 5,309 10,904 11,686
Cash paid for income taxes, net of refunds 2,716 2,598 9,150 7,239
Non-cash investing and financing activities:        
Purchases of property and equipment, accrued but not paid 49,713 49,098 49,713 49,098
Cash and cash equivalents 1,297,259 1,067,038 1,297,259 1,067,038
Total cash, cash equivalents, and restricted cash 1,303,251 1,071,516 1,303,251 1,071,516
Prepaid expenses and other current assets        
Restricted cash 5,992 4,351 5,992 4,351
Other assets        
Restricted cash $ 0 $ 127 $ 0 $ 127