Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Cash flow from operating activities:
Net income attributed to Synopsys	$ 757,516	$ 664,347	$ 532,367
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and depreciation	203,676	209,986	201,676
Reduction of operating lease right-of-use assets	86,645	82,895	0
Amortization of capitalized costs to obtain revenue contracts	64,698	61,185	62,750
Stock-based compensation	345,272	248,584	155,001
Allowance for credit losses	18,515	20,875	11,669
Deferred income taxes	(128,583)	(111,526)	(82,620)
Other non-cash	14,702	3,425	(5,045)
Net changes in operating assets and liabilities, net of acquired assets and liabilities:
Accounts receivable	201,706	(236,806)	(8,575)
Inventories	(48,046)	(55,024)	(17,396)
Prepaid and other current assets	(102,174)	(11,298)	(49,779)
Other long-term assets	(153,037)	(83,367)	(125,749)
Accounts payable and accrued liabilities	125,133	113,773	(19,280)
Operating lease liabilities	(82,581)	(78,578)	0
Income taxes	28,855	14,120	19,777
Deferred revenue	160,325	148,722	125,717
Net cash provided by operating activities	1,492,622	991,313	800,513
Cash flows from investing activities:
Proceeds from sales and maturities of short-term investments	12,850	0	0
Purchases of short-term investments	(161,732)	0	0
Proceeds from sales of long-term investments	0	2,151	6,361
Purchases of long-term investments	(7,591)	(2,762)	(3,245)
Purchases of property and equipment	(93,764)	(154,717)	(198,129)
Cash paid for acquisitions, net of cash acquired	(296,017)	(201,045)	(36,605)
Capitalization of software development costs	(1,976)	(4,045)	(4,259)
Other	(800)	0	0
Net cash used in investing activities	(549,030)	(360,418)	(235,877)
Cash flows from financing activities:
Proceeds from credit facilities	0	276,489	192,897
Repayment of debt	(28,061)	(288,879)	(524,063)
Issuances of common stock	210,719	197,403	156,364
Payments for taxes related to net share settlement of equity awards	(138,950)	(82,225)	(57,143)
Payments for Repurchase of Other Equity	(35,000)	0	0
Purchases of treasury stock	(753,081)	(242,078)	(329,185)
Other	(4,375)	(1,316)	(762)
Net cash used in financing activities	(748,748)	(140,606)	(561,892)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,369	17,154	2,782
Net change in cash, cash equivalents and restricted cash	197,213	507,443	5,526
Cash, cash equivalents and restricted cash, beginning of year	1,237,970	730,527	725,001
Cash, cash equivalents and restricted cash, end of year	1,435,183	1,237,970	730,527
Supplemental disclosure of cash flow information:
Cash paid for income taxes during the year:	149,762	70,711	75,744
Interest payments during the year:	$ 3,365	$ 5,136	$ 12,363