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Revenue and Deferred Revenue - Additional Information (Details 1) $ in Millions	Oct. 31, 2019 USD ($)
Revenue From Contract With Customer [Abstract]
Revenue expected to be recognized from remaining performance obligations	$ 0.2

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045

+ Details

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Balance Type:	credit
Period Type:	instant