Significant Accounting Policies - Impact of Adopting ASC 606 on Condensed Consolidated Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	$ 865,011	$ 729,978	$ 1,643,538	$ 1,376,113
Total cost of goods sold	490,334	436,671	945,520	811,041
Net income (loss)	$ 52,738	$ 13,856	$ 86,354	$ (459,507)
Diluted net income (loss) per potential common share (in dollars per share)	$ 0.33	$ 0.09	$ 0.55	$ (3.19)
Adjustments | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	$ (14,219)		$ (25,119)
Total cost of goods sold	(13,436)		(22,565)
Net income (loss)	$ (467)		$ (862)
Diluted net income (loss) per potential common share (in dollars per share)	$ 0		$ (0.01)
Balances without adoption of ASC 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	$ 850,792		$ 1,618,419
Total cost of goods sold	476,898		922,955
Net income (loss)	$ 52,271		$ 85,492
Diluted net income (loss) per potential common share (in dollars per share)	$ 0.33		$ 0.54