Condensed Consolidated Statement of Changes in Stockholders’ Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in-Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Oct. 31, 2016		139,767,627
Beginning balance at Oct. 31, 2016	$ 766,341	$ 1,398	$ 6,715,478	$ (24,329)	$ (5,926,206)
Net income (loss)	3,861				3,861
Other comprehensive income	6,158			6,158
Issuance of shares from employee equity plans (in shares)		1,494,979
Issuance of shares from employee equity plans	9,708	$ 15	9,693
Share-based compensation expense	12,825		12,825
Ending balance (in shares) at Jan. 31, 2017		141,262,606
Ending balance at Jan. 31, 2017	798,893	$ 1,413	6,737,996	(18,171)	(5,922,345)
Effect of adoption of new accounting standards	$ 62,123		832		61,291
Beginning balance (in shares) at Oct. 31, 2017	143,043,227	143,043,227
Beginning balance at Oct. 31, 2017	$ 2,136,342	$ 1,430	6,810,182	(11,017)	(4,664,253)
Net income (loss)	(473,363)				(473,363)
Other comprehensive income	$ 13,392			13,392
Repurchase of common stock (in shares)	(262,487)	(262,487)
Repurchase of common stock	$ (5,755)	$ (3)	(5,752)
Issuance of shares from employee equity plans (in shares)		1,400,042
Issuance of shares from employee equity plans	11,008	$ 15	10,993
Share-based compensation expense	$ 12,393		12,393
Ending balance (in shares) at Jan. 31, 2018	144,180,782	144,180,782
Ending balance at Jan. 31, 2018	$ 1,756,140	$ 1,442	$ 6,828,648	$ 2,375	$ (5,076,325)