CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Net income	$ 60,010	$ 33,546	$ 101,897	$ 35,997
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Change in unrealized gain (loss) on available-for-sale securities, net of tax	(6)	169	(533)	425
Change in cumulative translation adjustments	13,644	(2,724)	11,891	1,969
Other comprehensive income (loss)	15,691	(5,771)	18,834	736
Total comprehensive income	75,701	27,775	120,731	36,733
Change in unrealized gain (loss) on foreign currency forward contracts, net of tax
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Change in unrealized gain (loss) on foreign currency forward contracts and forward starting interest rate swaps, net of tax	2,380	(946)	2,906	518
Change in unrealized gain (loss) on forward starting interest rate swap, net of tax
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Change in unrealized gain (loss) on foreign currency forward contracts and forward starting interest rate swaps, net of tax	$ (327)	$ (2,270)	$ 4,570	$ (2,176)