Consolidated Statements Of Stockholders' Equity And Comprehensive Income (USD $) In Thousands, unless otherwise specified		Total	Common Stock	Capital In Excess Of Par Value	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Total Synopsys Shareholder's Equity	Non-Controlling Interest
Balance at Oct. 31, 2009		$ 1,844,166	$ 1,469	$ 1,500,166	$ 574,980	$ (228,618)	$ (3,831)	$ 1,844,166
Balance (in shares) at Oct. 31, 2009			146,945
Components of comprehensive income(loss):
Net income		237,063			237,063			237,063
Unrealized loss on investments, net of tax of $58 in 2012, $226 in 2011, and $1,522 in 2010		(2,307)					(2,307)	(2,307)
Deferred loss on cash flow hedges, net of tax of $1,101 in 2012, $3,049 in 2011, and $1,520 in 2010		(12,527)					(12,527)	(12,527)
Reclassification adjustment on deferred loss (gain) of cash flow hedges, net of tax of $(4,174) in 2012, $(422) in 2011, and $2,923 in 2010		(3,443)					(3,443)	(3,443)
Foreign currency translation adjustment		6,334					6,334	6,334
Other comprehensive income (loss)		(11,943)						(11,943)
Total comprehensive income (loss)		225,120						225,120
Purchase of treasury stock, shares		(8,236)	(8,236)
Purchases of treasury stock, value		(184,699)	(82)	82		(184,699)		(184,699)
Common stock issued (in shares)		9,770	9,770
Common stock issued		145,788	98	(28,672)	(41,369)	215,731		145,788
Stock compensation expense		59,979		59,979				59,979
Stock awards assumed in acquisition		4,598		4,598				4,598
Tax adjustments	[1]	5,230		5,230				5,230
Balance at Oct. 31, 2010		2,100,182	1,485	1,541,383	770,674	(197,586)	(15,774)	2,100,182
Balance (in shares) at Oct. 31, 2010			148,479
Components of comprehensive income(loss):
Net income		221,364			221,364			221,364
Unrealized loss on investments, net of tax of $58 in 2012, $226 in 2011, and $1,522 in 2010		(342)					(342)	(342)
Deferred loss on cash flow hedges, net of tax of $1,101 in 2012, $3,049 in 2011, and $1,520 in 2010		(8,477)					(8,477)	(8,477)
Reclassification adjustment on deferred loss (gain) of cash flow hedges, net of tax of $(4,174) in 2012, $(422) in 2011, and $2,923 in 2010		1,989					1,989	1,989
Foreign currency translation adjustment		1,659					1,659	1,659
Other comprehensive income (loss)		(5,171)						(5,171)
Total comprehensive income (loss)		216,193						216,193
Purchase of treasury stock, shares		(15,144)	(15,144)
Purchases of treasury stock, value		(401,836)	(151)	151		(401,836)		(401,836)
Equity forward contract		(33,335)		(33,335)				(33,335)
Common stock issued (in shares)		9,973	9,973
Common stock issued		163,682	99	(43,286)	(34,521)	241,390		163,682
Stock compensation expense		56,414		56,414				56,414
Balance at Oct. 31, 2011		2,101,300	1,433	1,521,327	957,517	(358,032)	(20,945)	2,101,300
Balance (in shares) at Oct. 31, 2011		143,308	143,308
Components of comprehensive income(loss):
Net income		181,898			182,402			182,402	(504)
Unrealized loss on investments, net of tax of $58 in 2012, $226 in 2011, and $1,522 in 2010		(215)					(215)	(215)
Deferred loss on cash flow hedges, net of tax of $1,101 in 2012, $3,049 in 2011, and $1,520 in 2010		(2,731)					(2,731)	(2,731)
Reclassification adjustment on deferred loss (gain) of cash flow hedges, net of tax of $(4,174) in 2012, $(422) in 2011, and $2,923 in 2010		14,235					14,235	14,235
Foreign currency translation adjustment		(5,805)					(5,805)	(5,805)
Other comprehensive income (loss)		5,484						5,484
Total comprehensive income (loss)		187,382						187,886
Purchase of treasury stock, shares		(2,474)	(2,474)
Purchases of treasury stock, value		(40,000)	(25)	33,360		(73,335)		(40,000)
Common stock issued (in shares)		10,065	10,065
Common stock issued		181,163	101	(40,990)	(41,225)	263,277		181,163
Stock compensation expense		71,337		71,337				71,337
Non-controlling interest in an acquired company		42,789							42,789
Balance at Oct. 31, 2012		$ 2,543,971	$ 1,509	$ 1,585,034	$ 1,098,694	$ (168,090)	$ (15,461)	$ 2,501,686	$ 42,285
Balance (in shares) at Oct. 31, 2012		150,899	150,899

[1] See Note 10 to the consolidated financial statements.