Unaudited Condensed Consolidated Statements of Stockholders' Equity Statement - USD ($) shares in Thousands, $ in Thousands		Total		Common Stock	Capital in Excess of Par Value	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Total Synopsys Stockholders’ Equity	Non-controlling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment | Accounting Standards Update 2014-09	[1]	$ 257,594				$ 257,594			$ 257,594
Cumulative effect adjustment | Accounting Standards Update 2018-02	[2]	(130,544)				(130,544)			(130,544)
Balance (in shares) at Oct. 31, 2018				149,265
Beginning balance at Oct. 31, 2018		3,485,015		$ 1,493	$ 1,644,830	2,543,688	$ (597,682)	$ (113,177)	3,479,152	$ 5,863
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		153,514				153,514			153,514
Other comprehensive income (loss), net of tax effects		$ 15,325						15,325	15,325
Purchases of treasury stock (in shares)		(346)		(346)
Purchases of treasury stock, value		$ (29,185)		$ (3)	3		(29,185)		(29,185)
Common stock issued, net of shares withheld for employee taxes (in shares)		357		357
Common stock issued, net of shares withheld for employee taxes		$ (4,320)		$ 3	(27,736)	(3,342)	26,755		(4,320)
Stock-based compensation		37,266			37,266				37,266
Balance (in shares) at Jan. 31, 2019				149,276
Ending balance at Jan. 31, 2019		3,784,665		$ 1,493	1,654,363	2,820,910	(600,112)	(97,852)	3,778,802	5,863
Balance (in shares) at Oct. 31, 2019				150,331
Beginning balance at Oct. 31, 2019		4,088,876	[3]	$ 1,503	1,635,455	3,164,144	(625,642)	(92,447)	4,083,013	5,863
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		104,061				104,061			104,061
Other comprehensive income (loss), net of tax effects		$ 9,136						9,136	9,136
Purchases of treasury stock (in shares)		(579)		(579)
Purchases of treasury stock, value		$ (80,000)		$ (6)	6		(80,000)		(80,000)
Equity forward contract		$ (20,000)			(20,000)				(20,000)
Common stock issued, net of shares withheld for employee taxes (in shares)		450		450
Common stock issued, net of shares withheld for employee taxes		$ 734		$ 5	(40,561)		41,290		734
Stock-based compensation		51,883			51,883				51,883
Balance (in shares) at Jan. 31, 2020				150,202
Ending balance at Jan. 31, 2020		$ 4,154,690		$ 1,502	$ 1,626,783	$ 3,268,205	$ (664,352)	$ (83,311)	$ 4,148,827	$ 5,863

[1] See Note 2. Summary of Significant Accounting Policies in the Company's Annual Report on Form 10-K for the year ended October 31, 2019 for additional information on the retained earnings adjustment due to adoption of Accounting Standards Codification (ASC) 606 and ASC 340, "Other Assets and Deferred Costs".

[2] See Note 11. Income Taxes in the Company's Annual Report on Form 10-K for the year ended October 31, 2019 for additional information on the retained earnings adjustment due to adoption of Accounting Standard Update (ASU) 2016-16.

[3] Derived from audited financial statements.