Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Net income (loss)	$ 50,840	$ 60,010	$ (408,667)	$ 101,897
Change in unrealized gain (loss) on available-for-sale securities, net of tax	279	(6)	(59)	(533)
Change in cumulative translation adjustments	(3,230)	13,644	(2,161)	11,891
Other comprehensive income	(3,633)	15,691	2,312	18,834
Total comprehensive income (loss)	47,207	75,701	(406,355)	120,731
Change in unrealized gain (loss) on foreign currency forward contracts, net of tax
Change in unrealized gain (loss) on foreign currency forward contracts and forward starting interest rate swaps, net of tax	(1,032)	2,380	(1,067)	2,906
Change in unrealized gain (loss) on forward starting interest rate swap, net of tax
Change in unrealized gain (loss) on foreign currency forward contracts and forward starting interest rate swaps, net of tax	$ 350	$ (327)	$ 5,599	$ 4,570