Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Cash flow from operating activities:
Net income attributed to Synopsys	$ 162,345	$ 104,061
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and depreciation	50,628	52,232
Reduction of operating lease right-of-use assets	20,974	23,201
Amortization of capitalized costs to obtain revenue contracts	15,008	13,762
Stock-based compensation	83,782	51,883
Allowance for doubtful accounts	7,477	4,861
Deferred income taxes	(20,222)	(17,694)
Other non-cash	(3,359)	(370)
Net changes in operating assets and liabilities, net of acquired assets and liabilities:
Accounts receivable	(14,910)	(246,364)
Inventories	(37,764)	(5,561)
Prepaid and other current assets	(12,289)	8,697
Other long-term assets	(50,385)	(27,103)
Accounts payable and accrued liabilities	(171,137)	(132,814)
Operating lease liabilities	(20,707)	(20,979)
Income taxes	12,226	5,039
Deferred revenue	152,291	196,969
Net cash provided by operating activities	173,958	9,820
Cash flows from investing activities:
Purchases of long-term investments	0	(2,500)
Purchases of property and equipment	(27,779)	(54,605)
Cash paid for acquisitions, net of cash acquired	(74,670)	(75,388)
Capitalization of software development costs	(1,011)	(1,065)
Net cash used in investing activities	(103,460)	(133,558)
Cash flows from financing activities:
Proceeds from credit facilities	0	196,490
Repayment of debt	(5,694)	(3,750)
Issuances of common stock	15,092	14,982
Payments for taxes related to net share settlement of equity awards	(49,591)	(14,242)
Purchase of equity forward contract	(50,000)	(20,000)
Purchases of treasury stock	(202,871)	(80,000)
Net cash (used in) provided by financing activities	(293,064)	93,480
Effect of exchange rate changes on cash, cash equivalents and restricted cash	10,001	2,013
Net change in cash, cash equivalents and restricted cash	(212,565)	(28,245)
Cash, cash equivalents and restricted cash, beginning of year	1,237,970	730,527
Cash, cash equivalents and restricted cash, end of period	$ 1,025,405	$ 702,282