Business and Organization - Additional Information (Detail) - Segment	7 Months Ended	9 Months Ended
Jul. 31, 2017	Sep. 30, 2017
Business And Organization [Line Items]
Number of reportable segments	1	2
Minimum [Member]
Business And Organization [Line Items]
Number of years of product experience		25 years

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration