Contingencies	3 Months Ended
Jan. 31, 2012
Contingencies [Abstract]
Contingencies	Note 16. Contingencies On November 30, 2011, the Company entered into a definitive agreement pursuant to which the Company, through its wholly owned subsidiary, agreed to acquire 100% of the outstanding common stock of Magma Design Automation, Inc. (Magma) in exchange for cash. Subsequent to the end of the quarter, the Company completed the Magma acquisition; also, see Note 18, Subsequent Events. The Company is subject to routine legal proceedings, as well as demands, claims and threatened litigation, which arise in the normal course of its business. The ultimate outcome of any litigation is uncertain and unfavorable outcomes could have a negative impact on the Company's financial position and results of operations. In connection with the Company's definitive merger agreement to acquire Magma, four putative stockholder class actions were filed against Magma, Magma's board of directors, Synopsys and the Synopsys merger subsidiary on December 5, 2011, December 9, 2011, December 13, 2011, and December 19, 2011, in state court in California and Delaware (collectively, the Magma Lawsuits). The Magma Lawsuits allege, among other things, that Magma and its directors breached their fiduciary duties to Magma's stockholders in negotiating and entering into the definitive merger agreement and by agreeing to sell Magma at an unfair price, and that Magma and Synopsys aided and abetted these alleged breaches of fiduciary duties. Subsequent to the end of the quarter, the parties to the Magma Lawsuits entered into a memorandum of understanding; also, see Note 18, Subsequent Events. On December 5, 2011, plaintiff Dynetix Design Solutions, Inc. filed a patent infringement lawsuit against the Company. The lawsuit alleges, among other things, that the Company's VCS functional verification tool, and more specifically its VCS multicore technology and VCS Cloud product, infringes Dynetix's United States Patent No. 6,466,898, and that such infringement is willful. The lawsuit seeks, among other things, compensatory damages and a permanent injunction.

Note 16. Contingencies

On November 30, 2011, the Company entered into a definitive agreement pursuant to which the Company, through its wholly owned subsidiary, agreed to acquire 100% of the outstanding common stock of Magma Design Automation, Inc. (Magma) in exchange for cash. Subsequent to the end of the quarter, the Company completed the Magma acquisition; also, see Note 18, Subsequent Events.

The Company is subject to routine legal proceedings, as well as demands, claims and threatened litigation, which arise in the normal course of its business. The ultimate outcome of any litigation is uncertain and unfavorable outcomes could have a negative impact on the Company's financial position and results of operations.

In connection with the Company's definitive merger agreement to acquire Magma, four putative stockholder class actions were filed against Magma, Magma's board of directors, Synopsys and the Synopsys merger subsidiary on December 5, 2011, December 9, 2011, December 13, 2011, and December 19, 2011, in state court in California and Delaware (collectively, the Magma Lawsuits). The Magma Lawsuits allege, among other things, that Magma and its directors breached their fiduciary duties to Magma's stockholders in negotiating and entering into the definitive merger agreement and by agreeing to sell Magma at an unfair price, and that Magma and Synopsys aided and abetted these alleged breaches of fiduciary duties. Subsequent to the end of the quarter, the parties to the Magma Lawsuits entered into a memorandum of understanding; also, see Note 18, Subsequent Events.

On December 5, 2011, plaintiff Dynetix Design Solutions, Inc. filed a patent infringement lawsuit against the Company. The lawsuit alleges, among other things, that the Company's VCS functional verification tool, and more specifically its VCS multicore technology and VCS Cloud product, infringes Dynetix's United States Patent No. 6,466,898, and that such infringement is willful. The lawsuit seeks, among other things, compensatory damages and a permanent injunction.