Fair Value Measurements (Details) - USD ($) $ in Thousands	Jul. 31, 2023	Jan. 31, 2023
Financial Assets:
Marketable securities	$ 4,648,393	$ 4,325,836
Commercial paper
Financial Assets:
Marketable securities	67,269	77,701
Agency bonds
Financial Assets:
Marketable securities	1,430,299	810,650
Corporate and other debt securities
Financial Assets:
Marketable securities	538,475	550,894
U.S. government agency securities
Financial Assets:
Marketable securities	2,561,779	2,861,215
Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	872,596	310,571
Marketable securities	4,648,393	4,325,836
Publicly held equity securities included in strategic investments	92,139	171,975
Total financial assets	5,617,135	4,823,054
Fair Value, Recurring Basis | Commercial paper
Financial Assets:
Marketable securities	67,269	77,701
Fair Value, Recurring Basis | Agency bonds
Financial Assets:
Marketable securities	1,430,299	810,650
Fair Value, Recurring Basis | Corporate and other debt securities
Financial Assets:
Marketable securities	538,475	550,894
Fair Value, Recurring Basis | U.S. government agency securities
Financial Assets:
Marketable securities	2,561,779	2,861,215
Fair Value, Recurring Basis | Treasury bills
Financial Assets:
Marketable securities	50,571	25,376
Fair Value, Recurring Basis | Certificates of deposit included in other assets, noncurrent
Financial Assets:
Certificates of deposit included in other assets, noncurrent	255	272
Fair Value, Recurring Basis | Privately held debt securities included in strategic investments
Financial Assets:
Marketable securities	3,752	14,400
Fair Value, Recurring Basis | Money market funds
Financial Assets:
Cash equivalents	801,409	310,571
Fair Value, Recurring Basis | Treasury bills
Financial Assets:
Cash equivalents	71,187
Fair Value, Recurring Basis | Level 1
Financial Assets:
Cash equivalents	801,409	310,571
Marketable securities	0	0
Publicly held equity securities included in strategic investments	92,139	171,975
Total financial assets	893,548	482,546
Fair Value, Recurring Basis | Level 1 | Commercial paper
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Level 1 | Agency bonds
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Level 1 | Corporate and other debt securities
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Level 1 | U.S. government agency securities
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Level 1 | Treasury bills
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Level 1 | Certificates of deposit included in other assets, noncurrent
Financial Assets:
Certificates of deposit included in other assets, noncurrent	0	0
Fair Value, Recurring Basis | Level 1 | Privately held debt securities included in strategic investments
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Level 1 | Money market funds
Financial Assets:
Cash equivalents	801,409	310,571
Fair Value, Recurring Basis | Level 1 | Treasury bills
Financial Assets:
Cash equivalents	0
Fair Value, Recurring Basis | Level 2
Financial Assets:
Cash equivalents	71,187	0
Marketable securities	4,648,393	4,325,836
Publicly held equity securities included in strategic investments	0	0
Total financial assets	4,719,835	4,326,108
Fair Value, Recurring Basis | Level 2 | Commercial paper
Financial Assets:
Marketable securities	67,269	77,701
Fair Value, Recurring Basis | Level 2 | Agency bonds
Financial Assets:
Marketable securities	1,430,299	810,650
Fair Value, Recurring Basis | Level 2 | Corporate and other debt securities
Financial Assets:
Marketable securities	538,475	550,894
Fair Value, Recurring Basis | Level 2 | U.S. government agency securities
Financial Assets:
Marketable securities	2,561,779	2,861,215
Fair Value, Recurring Basis | Level 2 | Treasury bills
Financial Assets:
Marketable securities	50,571	25,376
Fair Value, Recurring Basis | Level 2 | Certificates of deposit included in other assets, noncurrent
Financial Assets:
Certificates of deposit included in other assets, noncurrent	255	272
Fair Value, Recurring Basis | Level 2 | Privately held debt securities included in strategic investments
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Level 2 | Money market funds
Financial Assets:
Cash equivalents	0	0
Fair Value, Recurring Basis | Level 2 | Treasury bills
Financial Assets:
Cash equivalents	71,187
Fair Value, Recurring Basis | Level 3
Financial Assets:
Cash equivalents	0	0
Marketable securities	0	0
Publicly held equity securities included in strategic investments	0	0
Total financial assets	3,752	14,400
Fair Value, Recurring Basis | Level 3 | Commercial paper
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Level 3 | Agency bonds
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Level 3 | Corporate and other debt securities
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Level 3 | U.S. government agency securities
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Level 3 | Treasury bills
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Level 3 | Certificates of deposit included in other assets, noncurrent
Financial Assets:
Certificates of deposit included in other assets, noncurrent	0	0
Fair Value, Recurring Basis | Level 3 | Privately held debt securities included in strategic investments
Financial Assets:
Marketable securities	3,752	14,400
Fair Value, Recurring Basis | Level 3 | Money market funds
Financial Assets:
Cash equivalents	0	$ 0
Fair Value, Recurring Basis | Level 3 | Treasury bills
Financial Assets:
Cash equivalents	$ 0