CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Net income	$ 38,026	$ 13,997	$ 41,887	$ 2,451
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Change in unrealized gain (loss) on available-for-sale securities, net of tax	(278)	234	(527)	256
Change in cumulative translation adjustments	(2,243)	7,516	(1,753)	4,693
Other comprehensive income	(3,015)	12,157	3,143	6,507
Total comprehensive income	35,011	26,154	45,030	8,958
Change in unrealized gain 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	(899)	3,984	526	1,464
Change in unrealized gain 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	$ 405	$ 423	$ 4,897	$ 94