Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Cash flow from operating activities:
Net income attributed to Synopsys	$ 357,423	$ 213,981
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and depreciation	100,066	105,078
Reduction of operating lease right-of-use assets	42,711	39,513
Amortization of capitalized costs to obtain revenue contracts	30,475	28,279
Stock-based compensation	163,368	108,318
Allowance for doubtful accounts	10,051	9,982
Deferred income taxes	(16,461)	(37,681)
Other non-cash	(401)	97
Net changes in operating assets and liabilities, net of acquired assets and liabilities:
Accounts receivable	157,637	(84,533)
Inventories	(38,305)	(25,237)
Prepaid and other current assets	(45,972)	(5,889)
Other long-term assets	(97,519)	(38,378)
Accounts payable and accrued liabilities	(96,798)	(78,989)
Operating lease liabilities	(41,105)	(32,432)
Income taxes	(8,386)	1,270
Deferred revenue	183,512	186,360
Net cash provided by operating activities	700,296	389,739
Cash flows from investing activities:
Purchases of long-term investments	0	(2,762)
Purchases of property and equipment	(44,060)	(80,663)
Cash paid for acquisitions, net of cash acquired	(74,626)	(151,178)
Capitalization of software development costs	(1,264)	(2,130)
Other	(800)	0
Net cash used in investing activities	(120,750)	(236,733)
Cash flows from financing activities:
Proceeds from credit facilities	0	276,490
Repayment of debt	(13,194)	(178,437)
Issuances of common stock	103,203	98,361
Payments for taxes related to net share settlement of equity awards	(54,664)	(17,105)
Purchase of equity forward contract	0	(20,000)
Purchases of treasury stock	(398,082)	(180,000)
Other	(1,000)	0
Net cash used in financing activities	(363,737)	(20,691)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	6,457	(4,424)
Net change in cash, cash equivalents and restricted cash	222,266	127,891
Cash, cash equivalents and restricted cash, beginning of year	1,237,970	730,527
Cash, cash equivalents and restricted cash, end of period	$ 1,460,236	$ 858,418