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
Balance (in shares) at Oct. 31, 2017			150,445
Beginning balance at Oct. 31, 2017		$ 3,279,724	$ 1,505	$ 1,622,429	$ 2,143,873	$ (426,208)	$ (65,979)	$ 3,275,620	$ 4,104
Net income (loss)		(3,691)			(3,691)			(3,691)
Other comprehensive income (loss), net of tax effects		$ 28,787					28,787	28,787
Purchases of treasury stock (in shares)		(1,987)	(1,987)
Purchases of treasury stock, value		$ (180,000)	$ (20)	20		(180,000)		(180,000)
Equity forward contract		$ (20,000)		(20,000)				(20,000)
Common stock Issued, net of shares withheld for employee taxes (in shares)		495	495
Common stock issued, net of shares withheld for employee taxes		$ 3,700	$ 5	(22,103)	(6,328)	32,126		3,700
Stock-based compensation		32,113		32,113				32,113
Balance (in shares) at Jan. 31, 2018			148,953
Ending balance at Jan. 31, 2018		3,140,633	$ 1,490	1,612,459	2,133,854	(574,082)	(37,192)	3,136,529	4,104
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
Net income (loss)		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
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2014-09	[1]	257,594			257,594			257,594
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-16 [Member]	[2]	$ (130,544)			$ (130,544)			$ (130,544)

[1] See Note 2. Summary of Significant Accounting Policies for additional information on the retained earnings adjustment due to adoption of Accounting Standards Codification (ASC) 606 and ASC 340.

[2] See Note 14. Taxes for additional information on the retained earnings adjustment due to adoption of Accounting Standard Update (ASU) 2016-16.