Business Combinations - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Jul. 31, 2012	Jul. 31, 2012	Feb. 22, 2012
Magma Corporation
Business Acquisition [Line Items]
Acquisition price per share			$ 7.35
Total purchase consideration			$ 550,234,000
Goodwill arising from acquisition			303,487,000
Acquisition-related costs	900,000	32,700,000
Total fair value of stock awards assumed			22,200,000
Fair value of assumed equity awards allocated to purchase consideration			6,797,000
Fair value of assumed stock awards allocated for future services			15,400,000
Identifiable intangibles assets acquired			184,300,000
Magma Corporation | Minimum
Business Acquisition [Line Items]
Definite lived intangible asset amortization period		3 years
Magma Corporation | Maximum
Business Acquisition [Line Items]
Definite lived intangible asset amortization period		10 years
Other Fiscal 2012 Acquisitions
Business Acquisition [Line Items]
Total purchase consideration	78,500,000	78,500,000
Goodwill arising from acquisition	45,000,000	45,000,000
Acquisition-related costs	1,500,000	3,500,000
Acquired goodwill expected to be deductible for tax purposes	11,800,000	11,800,000
Identifiable intangibles assets acquired	$ 38,700,000	$ 38,700,000
Other Fiscal 2012 Acquisitions | Minimum
Business Acquisition [Line Items]
Definite lived intangible asset amortization period		3 years
Other Fiscal 2012 Acquisitions | Maximum
Business Acquisition [Line Items]
Definite lived intangible asset amortization period		8 years