Goodwill and Intangible Assets - Amortization Expense Related to Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization expense of intangible assets	$ 28,486	$ 32,500	$ 58,971	$ 70,876
Core/developed technology
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization expense of intangible assets	16,471	21,607	34,754	43,863
Customer relationships
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization expense of intangible assets	6,844	6,295	13,736	12,488
Contract rights intangible
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization expense of intangible assets	3,286	2,885	6,677	11,106
Trademarks and trade names
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization expense of intangible assets	896	792	1,838	1,583
Capitalized software development costs
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization expense of intangible assets	$ 989	$ 921	$ 1,966	$ 1,836