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Subsequent Events	12 Months Ended
Subsequent Events	Oct. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On November 2, 2017, the Company entered into a definitive agreement pursuant to which the Company has agreed to acquire privately held Black Duck Software, a leader in automated solutions for securing and managing open source software. The acquisition was completed on December 11, 2017 and under the terms of the definitive agreement, the Company paid approximately $547 million, net of cash acquired, and assumed certain unvested equity of Black Duck employees. The transaction was funded by U.S. cash.