Restructuring and Impairment - Additional Information (Details)		9 Months Ended
Apr. 12, 2019 USD ($) Employee	Jul. 31, 2019 USD ($)
Restructuring Costs [Abstract]
Reduction in force of employess \| Employee	135
Reduction in force of employee percentage	30.00%
Restructuring charges \| $	$ 0	$ 2,800,000

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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-Publisher FASB
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration