Significant Accounting Policies - Impact of Adopting ASC 606 on Condensed Consolidated Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	$ 960,606	$ 818,817	$ 2,604,144	$ 2,194,930
Total cost of goods sold	536,254	467,274	1,481,774	1,278,315
Net income (loss)	$ 86,749	$ 50,840	$ 173,103	$ (408,667)
Diluted net income (loss) per potential common share (in dollars per share)	$ 0.55	$ 0.34	$ 1.10	$ (2.84)
Adjustments | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	$ (2,413)		$ (27,533)
Total cost of goods sold	1,789		(20,776)
Net income (loss)	$ (3,879)		$ (4,781)
Diluted net income (loss) per potential common share (in dollars per share)	$ (0.02)		$ (0.03)
Balances without adoption of ASC 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	$ 958,193		$ 2,576,611
Total cost of goods sold	538,043		1,460,998
Net income (loss)	$ 82,870		$ 168,322
Diluted net income (loss) per potential common share (in dollars per share)	$ 0.53		$ 1.07