Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Net income (loss)	$ 52,738	$ 13,856	$ 86,354	$ (459,507)
Change in unrealized gain (loss) on available-for-sale securities, net of tax	112	(76)	413	(337)
Change in cumulative translation adjustments	(4,996)	(7,133)	(3,846)	1,069
Other comprehensive income (loss)	(8,566)	(7,447)	(13,426)	5,945
Total comprehensive income (loss)	44,172	6,409	72,928	(453,562)
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	(856)	(2,537)	704	(35)
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	$ (2,826)	$ 2,299	$ (10,697)	$ 5,248