Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Cash flow from operating activities:
Net income attributed to Synopsys	$ 556,069	$ 466,892
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and depreciation	151,274	159,156
Reduction of operating lease right-of-use assets	64,920	62,585
Amortization of capitalized costs to obtain revenue contracts	46,973	44,851
Stock-based compensation	248,530	170,155
Allowance for doubtful accounts	13,813	14,875
Deferred income taxes	(33,116)	(74,374)
Other non-cash	2,936	756
Net changes in operating assets and liabilities, net of acquired assets and liabilities:
Accounts receivable	188,996	(89,667)
Inventories	(51,448)	(20,296)
Prepaid and other current assets	(62,201)	(21,350)
Other long-term assets	(117,922)	(77,860)
Accounts payable and accrued liabilities	51,991	44,313
Operating lease liabilities	(61,666)	(57,968)
Income taxes	(29,414)	6,128
Deferred revenue	152,328	160,966
Net cash provided by operating activities	1,122,063	789,162
Cash flows from investing activities:
Proceeds from sales and maturities of short-term investments	1,128	0
Purchases of short-term investments	(146,082)	0
Proceeds from sales of long-term investments	0	2,151
Purchases of long-term investments	(7,591)	(2,762)
Purchases of property and equipment	(66,957)	(120,234)
Cash paid for acquisitions, net of cash acquired	(164,053)	(201,045)
Capitalization of software development costs	(1,517)	(3,035)
Other	(800)	0
Net cash used in investing activities	(385,872)	(324,925)
Cash flows from financing activities:
Proceeds from credit facilities	0	276,490
Repayment of debt	(21,637)	(284,218)
Issuances of common stock	113,976	123,237
Payments for taxes related to net share settlement of equity awards	(104,291)	(66,985)
Purchase of equity forward contract	(35,000)	0
Purchases of treasury stock	(538,082)	(200,000)
Other	(4,375)	0
Net cash used in financing activities	(589,409)	(151,476)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,985	8,700
Net change in cash, cash equivalents and restricted cash	149,767	321,461
Cash, cash equivalents and restricted cash, beginning of year	1,237,970	730,527
Cash, cash equivalents and restricted cash, end of period	$ 1,387,737	$ 1,051,988